### Implement WebSocket Transport for LSP Client

Source: https://github.com/codemirror/lsp-client/blob/main/README.md

Provides a basic WebSocket transport implementation for connecting to a language server. This example does not handle errors and is intended for demonstration purposes.

```javascript
import {Transport, LSPClient, languageServerExtensions} from "@codemirror/lsp-client"
import {basicSetup, EditorView} from "codemirror"
import {typescriptLanguage} from "@codemirror/lang-javascript"

function simpleWebSocketTransport(uri: string): Promise<Transport> {
  let handlers: ((value: string) => void)[] = []
  let sock = new WebSocket(uri)
  sock.onmessage = e => { for (let h of handlers) h(e.data.toString()) }
  return new Promise(resolve => {
    sock.onopen = () => resolve({
      send(message: string) { sock.send(message) },
      subscribe(handler: (value: string) => void) { handlers.push(handler) },
      unsubscribe(handler: (value: string) => void) { handlers = handlers.filter(h => h != handler) }
    })
  })
}

let transport = await simpleWebSocketTransport("ws://host:port")
let client = new LSPClient({extensions: languageServerExtensions()}).connect(transport)

new EditorView({
  extensions: [
    basicSetup,
    typescriptLanguage,
    client.plugin("file:///some/file.ts"),
  ],
  parent: document.body
})
```

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