[WIP] Disabling or customizing the floating sticky date

[Copilot]

• Analyze the repository structure and understand sticky date implementation
• Identify the DayAnimated component as the main floating sticky date component
• Run tests to ensure current state is working (tests pass)
• Plan minimal changes approach
• Add showStickyDate prop to GiftedChatProps interface
• Add showStickyDate prop to MessageContainerProps interface
• Update MessageContainer to conditionally render DayAnimated based on showStickyDate prop
• Create focused tests for the new functionality
• Verify the changes work correctly
• Update example/documentation if needed

Plan Summary

Add a showStickyDate?: boolean prop (default: true) to allow disabling the floating sticky date feature. The changes will be minimal and backward-compatible:

• New optional prop in type interfaces
• Conditional rendering of DayAnimated component
• Focused tests to verify functionality

This addresses the user's request to "disable it entirely" while maintaining the existing renderDay prop for customization when sticky dates are enabled.

Fixes #2622.

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[kesha-antonov]

@copilot merge master and retry make find solution in PR