LinkedText

[justinmc]

A new package that provides the ability to automatically add working links into text.

This was originally part of the framework (https://github.com/flutter/flutter/pull/125927), but is being moved to a package. The reason is a close dependency on the url_launcher package for most functionality, which the Flutter framework does not depend on. Specifically, building a fully functional link on the web platform requires url_launcher's Link widget, and that's something I want users to have out of the box.