fix: KeyboardAvoidingView types union

[kirillzyusko]

📜 Description

Removed union type for KeyboardAvodiingView.

💡 Motivation and Context

Initially I thought that changes in #711 are cool, but in reality it causes more headache to devs because TS not always can understand which behavior passed etc. So after all attempts the easiest option is to remove conditional types.

Closes #1340

📢 Changelog

JS

• don't use union types for KeyboardAvoidingView as it causes many TS errors where code is valid;

Example

• ported automatic mode to FabricExample project;
• moved options to separate file;

🤔 How Has This Been Tested?

Tested manually on iPhone 17 Pro (iOS 26.2).

📝 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
301499 bytes	301688 bytes	-189 bytes 📉