[Feature] Headless browser (chrome/chromium/firefox)

I'd love if I could add a headless browser to my dev container using the dev container features.

```json
"features": {
"headless-chrome": "latest",
"headless-chromium": "latest",
"headless-firefox": "latest",
}
```

All (that I know) JS/TS testing frameworks need it. Manually adding it without having to resort to `--no-sandbox` is very complicated. I have yet to succeed at it 😞
`--no-sandbox` is considered insecure and **strongly discouraged**.