fix: crash on catalyst

[kirillzyusko]

📜 Description

Fixed a crash when using ClippingScrollViewDecorator (KeyboardAwareScrollView/KeyboardChatScrollView) in MacCatalyst apps.

💡 Motivation and Context

That crash happens because we try to exchange of methods that don't exist in MacCatalyst implementation. When we run this code the UIKit gets backed by AppKit and mobile-specific methods don't exist. The fix is very simple - for mac catalyst we don't need to exchange the implementations of methods that don't exist.

Fix: #1454

📢 Changelog

iOS

• don't swizzle implementation of non-existing methods on MacCatalyst;

🤔 How Has This Been Tested?

Tested in example catalyst app:

📸 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
317542 bytes	317460 bytes	82 bytes 📈

[github-actions]

1. UIScrollView dynamic subclassing issue on macOS Catalyst
   Why: The code skips applying patches on macOS Catalyst due to AppKit-backed views but doesn't handle reverting existing subclasses if they were applied before, potentially causing runtime errors when UIScrollView instances are recreated.
   Fix: Add logic to revert the class changes when views move to a different environment or implement safeguards to prevent subclassing on AppKit-backed views.

2. Missing handling of existing patched classes
   Why: The current code doesn't check if the UIScrollView has already been patched, leading to potential issues with multiple initializations or state mismatches post-patch.
   Fix: Implement a mechanism to detect and clean up any existing patched classes when the environment changes or views are reinitialized.

LGTM