fix: Add missing boilerplate to WebSocketService (#3464)

This adds the missing `name` and `state` properties to
`WebSocketService`, enabling initialisation through the controller init
pattern in the clients.

Author: Mrtenz

packages/snaps-controllers/coverage.json

@@ -1,6 +1,6 @@
 {
   "branches": 95.22,
   "functions": 98.72,
-  "lines": 98.87,
+  "lines": 98.88,
   "statements": 98.71
 }

packages/snaps-controllers/src/websocket/WebSocketService.ts

@@ -83,6 +83,10 @@ type InternalSocket = {
 };
 
 export class WebSocketService {
+  name: typeof serviceName = serviceName;
+
+  state = null;
+
   readonly #messenger: WebSocketServiceMessenger;
 
   readonly #sockets: Map<string, InternalSocket>;