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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