[Feature] Hot reloading?

[AlexDaniel]

When using Cypress, I got used to the fact that whenever I edit any file, the runner will automatically reload my tests and rerun them. Maybe there's something wrong with my workflow, but in Playwright it's a little bit annoying to close the Inspector and rerun my test by hand whenever I do any change. Wouldn't it be nice if tests were restarted automatically whenever you were paused in the inspector? I think that'd help a lot given that most of the developer's time is spent in edit-run-debug loop.

[aslushnikov]

It'd be nice indeed; merging this to #7035