feat(ws): metrics (#9005)

* feat(WebSocketManager): fetch status

* feat(WebSocketShard): heartbeat event

* chore: ci

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/ws/__tests__/strategy/WorkerShardingStrategy.test.ts

@@ -114,6 +114,10 @@ vi.mock('node:worker_threads', async () => {
 				case WorkerSendPayloadOp.ShardCanIdentify: {
 					break;
 				}
+
+				case WorkerSendPayloadOp.FetchStatus: {
+					break;
+				}
 			}
 		}