feat: dynamic client registration (part 2)

[aholovko]

This PR updates client manager with validation logic and adds support for additional client metadata fields.

[codecov]

Codecov Report

Patch coverage: 90.68% and project coverage change: +0.07 🎉

Comparison is base (d5a28bf) 87.34% compared to head (1b5b5c8) 87.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1336      +/-   ##
==========================================
+ Coverage   87.34%   87.42%   +0.07%     
==========================================
  Files         148      149       +1     
  Lines        8774     8931     +157     
==========================================
+ Hits         7664     7808     +144     
- Misses        729      736       +7     
- Partials      381      387       +6     

Impacted Files	Coverage Δ
pkg/restapi/v1/issuer/controller.go	88.64% <86.04%> (-0.62%)	⬇️
pkg/service/clientmanager/client_manager.go	90.51% <90.51%> (ø)
cmd/vc-rest/startcmd/oauth_provider.go	97.61% <100.00%> (ø)
cmd/vc-rest/startcmd/start.go	80.50% <100.00%> (+0.15%)	⬆️
component/oidc/fosite/mongo/client.go	100.00% <100.00%> (ø)
component/oidc/fosite/redis/store.go	100.00% <100.00%> (ø)
pkg/restapi/v1/oidc4ci/controller.go	90.97% <100.00%> (+0.16%)	⬆️
pkg/service/clientmanager/api.go	100.00% <100.00%> (ø)
...rvice/oidc4ci/oidc4ci_service_initiate_issuance.go	92.02% <100.00%> (ø)

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