Logging: basic support

[vitalyisaev2]

Started work on new LOGGING external datasource.

[codecov]

Codecov Report

Attention: Patch coverage is 15.38462% with 22 lines in your changes missing coverage. Please review.

Project coverage is 64.28%. Comparing base (bb20e47) to head (ac507d4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/server/grpc_metrics.go	11.76%	15 Missing ⚠️
app/server/service_connector.go	33.33%	4 Missing ⚠️
common/errors.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   64.44%   64.28%   -0.17%     
==========================================
  Files         108      108              
  Lines        7592     7611      +19     
==========================================
  Hits         4893     4893              
- Misses       2372     2391      +19     
  Partials      327      327              

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