feat: implement Hashicorp Vault signing service #13361

Job	Run time
API-Tests	8m 48s
Checkstyle	5m 10s
End-To-End-Tests	11m 14s
Component-Tests	12m 36s
Javadoc	6m 34s
Postgresql-Integration-Tests	10m 57s
Unit-Tests	11m 2s
CodeQL / Analyze (java)	12m 38s
Verify-OpenApi / prepare-api-groups	3m 30s
Verify-OpenApi / verify-spec (control-api)	2m 11s
Verify-OpenApi / verify-spec (management-api)	2m 14s
Verify-OpenApi / verify-spec (observability-api)	1m 56s
Verify-OpenApi / verify-spec (public-api)	2m 17s
Verify-OpenApi / verify-spec (sts-accounts-api)	1m 48s
Verify-OpenApi / verify-spec (sts-api)	2m 19s
Verify-OpenApi / verify-spec (version-api)	1m 58s
	1h 37m 12s

Provide feedback