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 th

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

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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 inspi

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

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NetServices: Serialize the header of a BHttpRequest to a string

Change-Id: Ib1e22536a0b39dc6e9461e7993ea6784f1ea0e2f

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 o

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

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