[Feature] Testing Autofill behavior

Hi, it appears that [Chrome Devtools Protocol has added support for the Autofill interaction](https://chromedevtools.github.io/devtools-protocol/tot/Autofill/). [Puppeteer has added support](https://github.com/puppeteer/puppeteer/issues/10244), so I'm curious if we could see this come to playwright?

Thanks
cc @pavelfeldman

Start by reading the Chrome DevTools Protocol Autofill documentation and the linked Puppeteer issue, then inspect Playwright’s existing browser automation APIs and tests for the relevant entry point. Done means the requested Autofill behavior is supported in Playwright with appropriate test coverage.

Written by the indexing model from the issue text.