Add `client.errorWith(reason)` to WebSocket interceptor

```ts
      const errorEvent = new Event('error')

      Object.defineProperty(errorEvent, 'cause', {
        enumerable: true,
        configurable: false,
        value: reason,
      })

      this.data.connection.client.socket.dispatchEvent(errorEvent)
```

Using this in MSW to simulate client errors. Not very nice. 