fix: KeyboardChatScrollView + RefreshControl conflict

[kirillzyusko]

📜 Description

Resolveda non-working KeyboardChatScrollView if it's used together with RefreshControl.

💡 Motivation and Context

If we use RefreshControl on Android it wraps whole ScrollView:

As a result getChildAt(0) will return RefreshControl view (not ScrollView) and whole decoration approach will fail.

To overcome this problem I added a small helper that traverse all children to find a necessary view to apply proper decoration. It fully fixes the problem.

Closes #1396

📢 Changelog

Android

• added findScrollView helper;
• use findScrollView instead of this.getChildAt(0) for more reliable ScrollView detection;

🤔 How Has This Been Tested?

Tested manually on Pixel 9 Pro API 35.

📸 Screenshots (if appropriate):

Before	After

📝 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
307713 bytes	307616 bytes	97 bytes 📈