YDB: support authorization via service account

[vitalyisaev2]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 63.64%. Comparing base (5309cb2) to head (e476bab).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../server/datasource/rdbms/ydb/connection_manager.go	0.00%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
- Coverage   63.68%   63.64%   -0.04%     
==========================================
  Files         114      114              
  Lines        7916     7920       +4     
==========================================
  Hits         5041     5041              
- Misses       2541     2544       +3     
- Partials      334      335       +1     

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