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 80.46%. Comparing base (6363d4f) to head (f9995c2).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1721      +/-   ##
==========================================
+ Coverage   80.34%   80.46%   +0.12%     
==========================================
  Files         356      358       +2     
  Lines       14295    14432     +137     
  Branches     1565     1581      +16     
==========================================
+ Hits        11485    11612     +127     
- Misses       2178     2180       +2     
- Partials      632      640       +8     

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

... and 17 files with indirect coverage changes

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