fix: rewrite onTextChanged to onSelectionChanged event handler in KeyboardAwareScrollView

[kirillzyusko]

To Do

• looks like useAnimatedReaction on iOS doesn't work (FirstInputGrown image has changed); <-- revert assets
• Android - when scroll back disabled it still scrolls
• Android - when we type 1 we still have the same image as before - theoretically padding should be reduced.
• flaky Android scrolling <- fixed in e2e
• flaky FirstInputGrown <- fixed via clamp
• Android - TextInput after text change too close to keyboard
• on long text input removing a line still produces useAnimatedReaction and we scroll based on layout

📜 Description

💡 Motivation and Context

Closes #512

📢 Changelog

JS

iOS

Android

🤔 How Has This Been Tested?

📸 Screenshots (if appropriate):

📝 Checklist

• CI successfully passed
• I added new mocks and corresponding unit-tests if library API was changed

[github-actions]

📊 Package size report

Current size	Target Size	Difference
178128 bytes	176125 bytes	2003 bytes 📈