Add Accept header serialization

[EmilienKia]

Hello there,

Here is a small naive implementation of serialization (write) of Accept header.
It can be useful to use this header object at client side.

Please not that I have split in multiple commits, including the modification of the version.txt and some small modifications of a test file according to clang-format recommendation, to not block commits, even if it is not related to my modifications.

Bests.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.55%. Comparing base (15a6d96) to head (9c0b0e4).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/common/http_header.cc	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1235      +/-   ##
==========================================
+ Coverage   76.12%   77.55%   +1.43%     
==========================================
  Files          58       55       -3     
  Lines        9901     7409    -2492     
==========================================
- Hits         7537     5746    -1791     
+ Misses       2364     1663     -701     

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[Tachi107]

Hi Emilien, thanks for the patch! This looks good to me.

[kiplingw]

Thanks @EmilienKia!