Repository: facebook/react
Pull request: [DevTools] Increase max payload for websocket in standalone app

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## Summary

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 Explain the **motivation** for making this change. What existing problem does the pull request solve?
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When debugging applications that are experiencing runaway re-rendering, it is helpful to profile them in the React Developer Tools. Unfortunately there is a size limit on the captured profile which can make them impossible to inspect or save. The limitations I have found are in `postMessage` for the Chrome extension and in the `ws` websocket server for the standalone app.

Profiling an app that produces a large profile artifact will simply show that no profiling data was captured and output an error in the console, here shown for the standalone app:

```text
standalone.js:92 [React DevTools] Error with websocket connection i {target: H, type: 'error', message: 'Max payload size exceeded', error: RangeError: Max payload size exceeded
    at e.exports.haveLength (/Users/rune/.npm/_npx/8ea6ac5c50…}error: RangeError: Max payload size exceeded
```

This change simply increases the max payload of the websocket server in the standalone app so that larger profiles may be captured and inspected.

## How did you test this change?

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I verified that I could capture and inspect profiling data that previously exceeded the default limitation for a particular app

Changed files:
filename: packages/react-devtools-core/src/standalone.js
patch: @@ -329,7 +329,7 @@ function startServer(
   const httpServer = useHttps
     ? require('https').createServer(httpsOptions)
     : require('http').createServer();
-  const server = new Server({server: httpServer});
+  const server = new Server({server: httpServer, maxPayload: 1e9});
   let connected: WebSocket | null = null;
   server.on('connection', (socket: WebSocket) => {
     if (connected !== null) {