Provide TextInputController example

[Hackmodford]

Forgive me if this already exists. But I'm struggling to understand how to use Signals with a TextEditingController.

For example creating a computed signal based on text changing.

[rodydavis]

You do something like this:

final controller = TextEditingController();
late final controller$ = valueNotifierToSignal(controller);
...
effect(() {
  controller$.value.text; // Text string value
});