NetServices: format code using `haiku-format`

This commit formats all the netservices2 code with the `haiku-format` tool from
https://github.com/owenca/haiku-format (commit aa7408e), with the following
customizations:
* SpaceBeforeRangeBasedForLoopColon is set to false
* Braces before a catch block are not wrapped
* Most headers, except for ExclusiveBorrow.h, have been manually reformatted
to adhere to Haiku's header format (issue #19 in the repository)

Change-Id: I693c4515cf26402e48f35d1213ab6d5fcf14bd1e

NetServices: Disable BasicAuthTest for HTTPS

Change-Id: I0b61af00b96ebe7fbcd04da50e32cb9e9be7f890

NetServices: use BBorrow<BDataIO> for custom body targets

Change-Id: Ib2d4b0ca3689338d906f943295278c086c6f2c83

NetServices: Add debugging constants and messages

These allow for additional messages about the progress/status of the request.
For now, the messages are sent unconditionally, though it may be reasonable to
in the future switch to sending them only when enabled.

Change-Id: Ic45a0055037af02c689494fa5ce0acd03592ad7e

NetServices: Implement a logger for requests.

This logger can print to console or log to file.

Change-Id: I7eef847d42b360af1cb7cec0c897131b975a1f2f

NetServices: Rework parsing of content-length and move to HttpParser

This fixes a bug in the HttpAuthTest, and in general, moves responsibility of determining
the shape and size of the content to the right place.

Still to do is to fix the case where there really is a variable length content. This will
now probably error out as a connection closed error.

Change-Id: I13c20028e834cc9af8c7bc1d7d7613bf60838e64

NetServices: add the HttpSerializer helper to help serialize requests

Change-Id: Ide1e2d387884ce4cf2d406057960cd0732d61f38

NetServices: Implement controls on the number of concurrent requests.

This change allows the user to control how many concurrent request can be done
per session. This is going to be helpful to running the tests as well; they were
all fired up in parallel, which sometimes leads to our test server refusing a
connection.

Change-Id: I4f1f40b28b8e0199ea5589b36cd8d00ecd849a63

NetServices: Implement asynchronous status update messages.

The integration PostTest has a basic test that the expected messages are sent and
have the expected data fields. The gist is documented in book.dox.

To do are the messages around SSL. However, that functionality is also not
implemented yet, so there is nothing to send.

Change-Id: Ib8f36ed32f9854d643d8256338b71af7067059f0

NetServices: Remove Accept as standard and protected header.

In the old service kit, the Accept header was automatically set. However, it is
not a required header. This removes the default value and the protection against
setting it manually.

Required to make HaikuDepot work.

Change-Id: Ic589bfc5829db25915b67f2a13b6c2436c053e25

NetServices: Add support for an input body in a request and handle this with redirects.

Change-Id: Id2399d49aa673469c8c04ebd13884cdbcb24112d

NetServices: Implement BHttpSession::Cancel()

Change-Id: Iff0a7726e57f3e6bd4e9d0ebac08a370d25a62d7

NetServices: Add/rework the MaxRedirections, Timeout and StopOnError options

Change-Id: I4e59b51c16c6777941dc92ce02505386257dad03

NetServices: Add support for Basic authentication

Change-Id: I304104f7096fd935212e1bfa3e988e7945cb5cec

NetServices: add optional fields to BHttpRequest

Change-Id: I6228419a55c81203ce2c26827d17ff6a402d86c5

NetServices: Implement BHttpTime, parse_http_time() and format_http_time().

These utilities convert timestamp strings that are formatted according to
the HTTP RFC into BDateTime objects, and vice versa.

Change-Id: Ia2498944fb63d09233839f19d08f15d82a0a9685

NetServices: Implement BHttpStatusCode, BHttpStatusClass and Redirects

The user of the API can set whether redirects should be followed, and if so,
how many. This is part of the BHttpRequest API. The BHttpSession then follows
those instructions, and executes the maximum number of redirects the user
would like to follow.

As part of this commit, the BHttpStatusClass and BHttpStatusCodes helper enums
have been added, to give a friendlier access to HTTP status codes and status
classes.

Change-Id: Ic8c9e3fda158e2cce549c8f1d360951f7ac83311

NetServices: implement support for HEAD requests and 204 responses.

These particular responses will not have a body. This is now handled by the
BHttpSession object. There is also a minor fix in here that prevents a crash
when multiple requests are handled by the DataThread at the same time, and not
all of the requests have events.

Change-Id: I7f47d8b3cd8491c8193275be4b3fc1080780fa20

NetServices: partial implementation of the receive function

This initial implementation contains a lot of extra debuggin output that will
be removed in future changes. It is now possible to run a simple GET request
to the test server with gzip encoding.

Change-Id: I2c402e5cf80b94b366563888222a891a1b094b7a

NetServices: Rewrite BHttpFields to use raw strings as underlying data storage

This change also drops the principle that fields with the same keys would be
grouped together. This was initially inspired by Boost::Beast, but it means a
lot of extra copying of data when adding/organizing the list, as well as
inefficient querying on each add. Now that the design choice is to fully go
for the raw string as underlying data storage, that choice is not necessary.
In the future it may be able to emulate the grouping or retrieving of lists
of values in the API, rather than as a fundamental principle of the data
storage.

Change-Id: I2667cfa38eb3b7b75393ee71fb038231a40b4193

NetServices: add testserver.py and proxy.py test infrastructure

This adds the existing testing facilities to the netservices2kit.

Change-Id: Idd884a800abda967bc4b65a416a5f6d927f37450

NetServices: Introduce BHttpRequestStream and abstract interface.

This supports asynchronous transfers of Http Requests to a network
interface.

Change-Id: I845fb2e08160d219f85b7a08d2d8872ac7359b47

NetServices: Serialize the header of a BHttpRequest to a string

Change-Id: Ib1e22536a0b39dc6e9461e7993ea6784f1ea0e2f

NetServices: implement hostname resolution and connection for BHttpRequest

BHttpSession::Execute() moves the request into the session, and returns a future BHttpResponse
object. Currently implemented are resolving the hostname, and opening the connection.

There is some scaffolding for the actual data transfer.

Change-Id: I5a8a7a7f8680036b91cdba4beee140bbed6bfd5a

NetServices: Introduce BHttpRequest class

Objects of this class describe a HTTP request. It contains several convenience
functions that will allow a user to describe the properties of the request.
More options to be added later.

Change-Id: If6a00d26808c5ed4b121cb36dc75a2a1cc449f95

NetServices: Add BHttpMethod that represents a HTTP method

This class provides defaults and performs basic validation for HTTP Methods as
defined by the standard. They will be used in conjunction with a future
BHttpRequest class.

Change-Id: If69a7ec186d9d1165e8efe5ab5df50d5a089208d

NetServices: Introduce BHttpFields to query and manipulate fields in HTTP messages

HTTP messages (requests and responses) have a header section that can contain
HTTP headers. These headers consist of name, value pairs. This class can be
used to query the headers on a response, and build a list of headers for a
request.

The internal implementation is designed around two different methods of storing
the underlying data. For HTTP requests, the name, value pairs are stored as
owned BString objects. For responses, the assumption is that there is a byte
buffer that contains the data and that has the same lifetime as the BHttpFields
object. The name, value pairs will then be stored as std::string_view to the
underlying buffer.

Still to do is:
- The method to convert a BHttpFields list into a string buffer to transmit.
- The method to parse a string buffer and turn it into a BHttpFields object.

Change-Id: I4819db100aa1671aa7403675216a4c85fd221da7

netservices: add BHttpHeader class and BHttpHeaderMap skeleton

Change-Id: I36a7c757a6909604d749355ecb1a9d42d05d7306