Add MtlsTokenProvider for mTLS authentication

[rustam-gamidov-here]

Implementing auto refreshing in place not using AutoRefreshToken and TokenEndpoint for simplicity and because mtls endpoint has very simple list of arguments and some features implemented in client authentication may be not supported at the moment.

Relates-To: DATASDK-105

[codecov]

Codecov Report

❌ Patch coverage is 81.48148% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.46%. Comparing base (6363d4f) to head (afeae6e).

Files with missing lines	Patch %	Lines
...p-cpp-sdk-authentication/src/MtlsTokenProvider.cpp	82.72%	8 Missing and 6 partials ⚠️
...dk-authentication/src/AuthenticationClientImpl.cpp	85.11%	3 Missing and 4 partials ⚠️
...ion/include/olp/authentication/MtlsTokenProvider.h	60.00%	2 Missing ⚠️
...pp-sdk-authentication/src/AuthenticationClient.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1722      +/-   ##
==========================================
+ Coverage   80.34%   80.46%   +0.12%     
==========================================
  Files         356      358       +2     
  Lines       14295    14426     +131     
  Branches     1565     1581      +16     
==========================================
+ Hits        11485    11607     +122     
- Misses       2178     2181       +3     
- Partials      632      638       +6     

Files with missing lines	Coverage Δ
.../include/olp/authentication/AuthenticationClient.h	100.00% <ø> (ø)
...ion/include/olp/authentication/MtlsTokenProvider.h	60.00% <60.00%> (ø)
...pp-sdk-authentication/src/AuthenticationClient.cpp	94.29% <0.00%> (-5.71%)	⬇️
...dk-authentication/src/AuthenticationClientImpl.cpp	81.75% <85.11%> (+0.55%)	⬆️
...p-cpp-sdk-authentication/src/MtlsTokenProvider.cpp	82.72% <82.72%> (ø)

... and 8 files with indirect coverage changes

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