net: lib: http_server: Initial HTTP server support

Original code developed as a GSoC 2023 project by Emna Rekik.

Code refactored in order to provide better bisectability
as the origical commits were not bisectable.

The server supports static and dynamic resources, managed by
HTTP_SERVICE/HTTP_RESOURCE macros.

Fixes #59685
Fixes #59686
Fixes #59688
Fixes #59690
Fixes #59670
Fixes #59700
Fixes #59684
Fixes #59693
Fixes #59693
Fixes #59694
Fixes #59699
Fixes #59696
Fixes #59688
Fixes #59690
Fixes #59670
Fixes #59700
Fixes #59685
Fixes #59686
Fixes #59688
Fixes #59691

Signed-off-by: Emna Rekik <emna.rekik007@gmail.com>
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>