[SDK Ergonomics] NEXUS-519: Add link to QueryWorkflowResponse

For Nexus Operations. Query is both read-only and sync- so
1. no callbacks
2. the link is only from caller to the handler- and is specifically a workflow link as there isnt a history event in handler for query

Author: mavemuri

temporal/api/workflowservice/v1/request_response.proto

@@ -1187,6 +1187,8 @@ message QueryWorkflowRequest {
 message QueryWorkflowResponse {
     temporal.api.common.v1.Payloads query_result = 1;
     temporal.api.query.v1.QueryRejected query_rejected = 2;
+    // Holds the link to the Workflow execution that processed the Query. 
+    temporal.api.common.v1.Link link = 3;
 }
 
 message DescribeWorkflowExecutionRequest {