[configtls] add include_system_ca_certs_pool

[atoulme]

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Description: Add include_system_ca_certs_pool to configtls, allowing to load system certs and additional custom certs.

Link to tracking Issue: Fixes #7774

Testing: UTs

Documentation: Added to README

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.37%. Comparing base (72f6ce1) to head (073f6b1). Report is 173 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9142      +/-   ##
==========================================
+ Coverage   90.34%   90.37%   +0.02%     
==========================================
  Files         340      340              
  Lines       17989    17996       +7     
==========================================
+ Hits        16253    16263      +10     
+ Misses       1412     1410       -2     
+ Partials      324      323       -1     

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[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[atoulme]

Rebased, anything else to do here?

[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.