SNOW-1569293 Read encryption headers in a case insensitive way

[sfc-gh-knozderko]

Description

SNOW-1569293 Read encryption headers in a case insensitive way

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

Attention: Patch coverage is 80.64516% with 6 lines in your changes missing coverage. Please review.

Project coverage is 86.13%. Comparing base (6d0ba1f) to head (e2272f1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...leTransfer/StorageClient/SFSnowflakeAzureClient.cs	76.47%	2 Missing and 2 partials ⚠️
...Data/Core/FileTransfer/StorageClient/SFS3Client.cs	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1067      +/-   ##
==========================================
- Coverage   86.32%   86.13%   -0.20%     
==========================================
  Files         121      121              
  Lines       11821    11845      +24     
  Branches     1205     1212       +7     
==========================================
- Hits        10205    10203       -2     
- Misses       1329     1350      +21     
- Partials      287      292       +5     

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