Feat/service accounts

[lfbrehm]

In this PR all missing service account gRPC requests are implemented.

[codecov]

Codecov Report

Attention: 585 lines in your changes are missing coverage. Please review.

Comparison is base (d81cd55) 52.72% compared to head (a34e03a) 50.28%.
Report is 10 commits behind head on dev.

Files	Patch %	Lines
src/grpc/service_account.rs	0.00%	212 Missing ⚠️
src/middlelayer/service_account_request_types.rs	0.00%	184 Missing ⚠️
src/middlelayer/service_accounts_db_handler.rs	0.00%	158 Missing ⚠️
src/utils/conversions.rs	0.00%	21 Missing ⚠️
src/utils/grpc_utils.rs	0.00%	7 Missing ⚠️
src/grpc/hooks.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #137      +/-   ##
==========================================
- Coverage   52.72%   50.28%   -2.44%     
==========================================
  Files          78       80       +2     
  Lines       11629    12199     +570     
==========================================
+ Hits         6131     6134       +3     
- Misses       5498     6065     +567     

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[St4NNi]

LGTM!