feat(base64 cleaner): first iteration

[john-traas]

I'm exploring the possibility of having a pipeline to sanitize base64 data.

This implementation includes several security measures:

• • MIME type validation: Only allows specific image types (JPEG, PNG, GIF, SVG, WebP)
• • File size limits: Prevents DoS attacks with large files (5MB maximum)
• • SVG sanitization: Removes potentially malicious scripts and event handlers using DOMPurify
• • Base64 validation: Ensures the data is actually valid base64 format
• • URL validation: Only allows HTTP/HTTPS protocols for remote image fetching
• • Timeout for URL fetching: Prevents hanging on slow resources (10 second limit)
• • Event handler blocking: Explicitly blocks all event handlers in SVGs (onclick, onload, etc.)
• • Content hashing: Provides hash generation for caching and integrity verification

This is an initial draft. Further considerations are:

1. Add dimension limits, adding maximum width/height checks for images to prevent extremely large images from being processed.
2. Improve error messages to make them more user-friendly for end users.
3. Add progress callbacks for large images to show processing status (might not be needed as file size is limited).
4. Consider format conversion for better performance, maybe converting all images to a consistent format like WebP.
5. Add more security tests: Test with actual malicious SVGs and polyglot files.

I have not worked on the tests thoroughly yet.

[github-actions]

Documentation has been published to https://lundalogik.github.io/lime-elements/versions/PR-3468/

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