[resotocore][feat] --ca-cert is added to the client context

[aquamatthias]

Description

A CA certificate passed to --ca-cert is added to the client SSL context.

To-Dos

• Add test coverage for new or updated functionality
• Lint and test with tox

Code of Conduct

By submitting this pull request, I agree to follow the code of conduct.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (18f7567) 89.85% compared to head (a343850) 89.94%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1792      +/-   ##
==========================================
+ Coverage   89.85%   89.94%   +0.08%     
==========================================
  Files          91       91              
  Lines       15495    15500       +5     
==========================================
+ Hits        13923    13941      +18     
+ Misses       1572     1559      -13     

Flag	Coverage Δ
resotocore	89.94% <82.35%> (+0.08%)	⬆️

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Files	Coverage Δ
resotocore/resotocore/web/certificate_handler.py	92.85% <82.35%> (+8.96%)	⬆️

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