OZG-6259 get vorgang and trigger create collaboration vorgang

...gang/collaboration/CreateCollaborationVorgangRequest.java

...ollaboration/CreateCollaborationVorgangRequestMapper.java

.../java/de/ozgcloud/vorgang/vorgang/GrpcVorgangService.java

...e/ozgcloud/vorgang/collaboration/CollaborationITCase.java

...cloud/vorgang/collaboration/CollaborationServiceTest.java

...boration/CreateCollaborationVorgangRequestMapperTest.java

...oration/CreateCollaborationVorgangRequestTestFactory.java

...ng/collaboration/GrpcCollaborationRequestTestFactory.java

...a/de/ozgcloud/vorgang/vorgang/GrpcVorgangServiceTest.java