feat(api): add user creation to user service

[livio-a]

closes #5017

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[codecov]

Codecov Report

Merging #5745 (2f98ebc) into main (991a563) will decrease coverage by 0.11%.
The diff coverage is 49.26%.

@@            Coverage Diff             @@
##             main    #5745      +/-   ##
==========================================
- Coverage   48.42%   48.31%   -0.11%     
==========================================
  Files         693      716      +23     
  Lines       72237    73343    +1106     
==========================================
+ Hits        34981    35437     +456     
- Misses      35620    36234     +614     
- Partials     1636     1672      +36     

Impacted Files	Coverage Δ
internal/api/authz/authorization.go	65.38% <0.00%> (+11.70%)	⬆️
internal/api/grpc/admin/export.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/server.go	0.00% <0.00%> (ø)
internal/api/grpc/management/idp_converter.go	9.39% <0.00%> (-0.06%)	⬇️
...i/grpc/management/project_application_converter.go	0.00% <0.00%> (ø)
internal/api/grpc/management/server.go	0.00% <0.00%> (ø)
internal/api/grpc/management/user.go	0.00% <0.00%> (ø)
internal/api/grpc/server/gateway.go	3.84% <0.00%> (-5.53%)	⬇️
...nal/api/grpc/server/middleware/auth_interceptor.go	72.00% <0.00%> (-10.61%)	⬇️
.../api/grpc/server/middleware/service_interceptor.go	0.00% <0.00%> (ø)
... and 28 more

... and 39 files with indirect coverage changes

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[github-actions]

🎉 This PR is included in version 2.24.0-ignore-me2.1 🎉

The release is available on GitHub release

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