CONV-049: Add PNG to WEBP converter capability

[menvil]

Summary

• Add PngToWebpConverter with quality, lossless, resize, remove_metadata options.

Test plan

• composer test
• composer lint

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Summary by cubic

Add a PNG to WEBP converter to produce smaller, web-friendly images. Implements CONV-049 with options for quality, lossless, resize, and removing metadata, and includes unit tests for schema and defaults.

^{Written for commit edab1e2. Summary will update on new commits.}

Review in cubic

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-049-add-png-to-webp-converter-capability

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