Allow to set CAINFO blob for HTTPS proxy

[diachenko-mischa]

CAINFO for the HTTPS proxy must be passed
as a specific parameter into easy_handle
instead of general CAINFO

Relates-To: HERESUP-80353

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.39%. Comparing base (6363d4f) to head (255d259).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1721      +/-   ##
==========================================
+ Coverage   80.34%   80.39%   +0.05%     
==========================================
  Files         356      356              
  Lines       14295    14299       +4     
  Branches     1565     1565              
==========================================
+ Hits        11485    11495      +10     
+ Misses       2178     2175       -3     
+ Partials      632      629       -3     

Files with missing lines	Coverage Δ
olp-cpp-sdk-core/src/http/NetworkProxySettings.cpp	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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