FR - LayoutExplorer - Add option to quick jump to overflowing widget

[kenzieschmoll]

Having an option to quick jump to the widget causing the render overflow error would make it easier for users to diagnose layout issues and would avoid mistakes where users are inspecting the incorrect widget. See https://github.com/flutter/devtools/issues/1545

If there are multiple widgets causing errors, perhaps we could populate a dropdown with the current error-causing widgets.

[InMatrix]

@raison00 is taking a look at the issue.