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: use BBorrow<BDataIO> for custom body targets

Change-Id: Ib2d4b0ca3689338d906f943295278c086c6f2c83

NetServices: Implement a logger for requests.

This logger can print to console or log to file.

Change-Id: I7eef847d42b360af1cb7cec0c897131b975a1f2f

NetServices: add the HttpSerializer helper to help serialize requests

Change-Id: Ide1e2d387884ce4cf2d406057960cd0732d61f38

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: 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: 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: 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