Add GetFullCollectionById endpoint

[illia-malachyn]

Closes: #748

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 31.57895% with 39 lines in your changes missing coverage. Please review.

Project coverage is 52.38%. Comparing base (f839f68) to head (c8d6c13).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
access/grpc/convert/convert.go	0.00%	16 Missing ⚠️
access/grpc/grpc.go	40.00%	11 Missing and 1 partial ⚠️
collection.go	0.00%	7 Missing ⚠️
access/grpc/client.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   51.42%   52.38%   +0.95%     
==========================================
  Files          35       35              
  Lines        5499     5559      +60     
==========================================
+ Hits         2828     2912      +84     
+ Misses       2309     2261      -48     
- Partials      362      386      +24     

Flag	Coverage Δ
unittests	52.38% <31.57%> (+0.95%)	⬆️

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