OZG-6311 Create stub classes

alfa-service/src/main/java/de/ozgcloud/alfa/collaboration/CollaborationController.java

+package de.ozgcloud.alfa.collaboration;
+
+import org.springframework.hateoas.EntityModel;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import de.ozgcloud.alfa.vorgang.Vorgang;
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequestMapping(CollaborationController.PATH)
+@RequiredArgsConstructor
+public class CollaborationController {
+
+	private final CollaborationRequestModelAssembler assembler;
+	private final CollaborationService service;
+
+	static final String PATH = "/api/collaborationrequests/"; // NOSONAR
+
+	@GetMapping("/{collaborationRequestId}")
+	public EntityModel<Vorgang> getVorgangWithEingang(@PathVariable String collaborationRequestId) {
+		return null;
+	}
+}

alfa-service/src/main/java/de/ozgcloud/alfa/collaboration/CollaborationRequestModelAssembler.java

+package de.ozgcloud.alfa.collaboration;
+
+class CollaborationRequestModelAssembler {
+
+}

alfa-service/src/main/java/de/ozgcloud/alfa/collaboration/CollaborationService.java

+package de.ozgcloud.alfa.collaboration;
+
+class CollaborationService {
+
+}