Add subscribe account statuses endpoint

[illia-malachyn]

Closes: #747

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.87850% with 44 lines in your changes missing coverage. Please review.

Project coverage is 56.28%. Comparing base (7b58582) to head (f394c03).
Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
access/grpc/convert/convert.go	0.00%	23 Missing ⚠️
access/grpc/grpc.go	80.76%	10 Missing and 5 partials ⚠️
access/grpc/client.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
+ Coverage   52.92%   56.28%   +3.36%     
==========================================
  Files          35       35              
  Lines        5580     5987     +407     
==========================================
+ Hits         2953     3370     +417     
+ Misses       2231     2127     -104     
- Partials      396      490      +94     

Flag	Coverage Δ
unittests	56.28% <58.87%> (+3.36%)	⬆️

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[peterargue]

added one small comment, but otherwise looks good

[peterargue]

@illia-malachyn can you fix the conflicts, then this is ready to merge