feat: add `toBuilder()` methods #13453

Job	Run time
Checkstyle	1m 9s
Component-Tests	1m 9s
End-To-End-Tests	1m 10s
Javadoc	1m 7s
Unit-Tests	1m 8s
API-Tests	1m 9s
Postgresql-Integration-Tests	1m 9s
CodeQL / Analyze (java)	1m 8s
Verify-OpenApi / prepare-api-groups	1m 8s
Verify-OpenApi / verify-spec	1s
	10m 18s

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