Add support for Retry-After header

[andrey-kashcheev]

Optional additional waiting time between retry
attempts. Only version with seconds is supported

Relates-To: DATASDK-107

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.50%. Comparing base (994e6a2) to head (2154485).

Files with missing lines	Patch %	Lines
olp-cpp-sdk-core/src/client/OlpClient.cpp	78.57%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1726      +/-   ##
==========================================
+ Coverage   80.44%   80.50%   +0.06%     
==========================================
  Files         358      358              
  Lines       14431    14443      +12     
  Branches     1581     1582       +1     
==========================================
+ Hits        11608    11626      +18     
+ Misses       2184     2177       -7     
- Partials      639      640       +1     

Files with missing lines	Coverage Δ
olp-cpp-sdk-core/src/client/OlpClient.cpp	89.72% <78.57%> (+0.61%)	⬆️

... and 4 files with indirect coverage changes

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