Add a new endpoint in BlobApi to support objectstore.

[asopov-here]

Handle /layers/{layer_id}/keys/{key} path.

Add tests

Relates-To: DATASDK-103

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.46%. Comparing base (403d2bd) to head (4e5b34f).

Files with missing lines	Patch %	Lines
...sdk-dataservice-read/src/generated/api/BlobApi.cpp	95.83%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1724      +/-   ##
==========================================
+ Coverage   80.45%   80.46%   +0.01%     
==========================================
  Files         358      358              
  Lines       14426    14450      +24     
  Branches     1581     1586       +5     
==========================================
+ Hits        11605    11626      +21     
- Misses       2182     2184       +2     
- Partials      639      640       +1     

Files with missing lines	Coverage Δ
...sdk-dataservice-read/src/generated/api/BlobApi.cpp	94.12% <95.83%> (+15.55%)	⬆️

... and 2 files with indirect coverage changes

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