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 95.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.50%. Comparing base (403d2bd) to head (338d6b0).

Files with missing lines	Patch %	Lines
...-sdk-dataservice-read/src/VersionedLayerClient.cpp	50.00%	2 Missing ⚠️
...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%   80.50%   +0.05%     
==========================================
  Files         358      359       +1     
  Lines       14426    14486      +60     
  Branches     1581     1589       +8     
==========================================
+ Hits        11605    11661      +56     
- Misses       2182     2185       +3     
- Partials      639      640       +1     

Files with missing lines	Coverage Δ
...read/include/olp/dataservice/read/KeyDataRequest.h	100.00% <100.00%> (ø)
...nclude/olp/dataservice/read/VersionedLayerClient.h	100.00% <ø> (ø)
...-dataservice-read/src/VersionedLayerClientImpl.cpp	82.55% <100.00%> (+0.57%)	⬆️
...dk-dataservice-read/src/VersionedLayerClientImpl.h	100.00% <ø> (ø)
...taservice-read/src/repositories/DataRepository.cpp	97.52% <100.00%> (+0.20%)	⬆️
...sdk-dataservice-read/src/generated/api/BlobApi.cpp	94.12% <95.83%> (+15.55%)	⬆️
...-sdk-dataservice-read/src/VersionedLayerClient.cpp	91.18% <50.00%> (-2.57%)	⬇️

... and 1 file with indirect coverage changes

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