Fix/animated stickers

[marceloapd]

WebP Animation Preservation Enhancement

Problem Statement

When sending .gif or animated .webp files as stickers, the animation is lost in the conversion process.

Solution

Modified the convertToWebP method to detect animated content and preserve animations during conversion using Sharp's animation support.

Technical Details

• Added detection for animated GIFs and WebPs
• Implemented Sharp's animated: true option for animation preservation
• Added a helper method to inspect WebP headers for animation chunks

Benefits

• Users can now send animated stickers properly
• Maintains full backward compatibility with existing code
• No changes to method signatures or calling code required

This enhancement addresses a specific functional gap without disrupting existing workflows.

Summary by Sourcery

Bug Fixes:

• Fixes a bug where animations were lost when sending .gif or animated .webp files as stickers.