AWS WIF impersonation (LibSFC)

[sfc-gh-ddas]

SNOW-2236576 | SNOW-2236579: Transitive service account impersonation

Added support for service account impersonation using comma separated delegation chain for AWS.

The change was based off logic in JDBC equivalent and tested using unit tests with a mock HTTP client.

Depends on #950 and #949

[codecov]

Codecov Report

❌ Patch coverage is 40.95745% with 111 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.79%. Comparing base (b29a564) to head (498e431).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
cpp/GcpAttestation.cpp	12.03%	95 Missing ⚠️
cpp/AwsAttestation.cpp	85.33%	11 Missing ⚠️
cpp/http/HttpClient.cpp	0.00%	3 Missing ⚠️
cpp/AzureAttestation.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #951      +/-   ##
==========================================
- Coverage   79.51%   78.79%   -0.72%     
==========================================
  Files         127      127              
  Lines       10870    11055     +185     
==========================================
+ Hits         8643     8711      +68     
- Misses       2227     2344     +117     

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