CONV-050: Add PNG to PDF converter capability

[menvil]

Summary

• Add PngToPdfConverter with PDF-specific options (page_size, orientation, margin, fit_mode, compression).

Test plan

• composer test
• composer lint

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Summary by cubic

Adds a PNG to PDF converter with configurable page size, orientation, margin, fit mode, and compression. Fulfills CONV-050 and validates options with OptionsValidator.

• New Features
  • New PngToPdfConverter (key: png:pdf) with label “PDF” and a short description.
  • Options schema with defaults: page_size (auto/A4/Letter), orientation (auto/portrait/landscape), margin (none/small/medium), fit_mode (contain/cover/original), compression (none/balanced/small).
  • Unit tests cover converter metadata and default option validation.

^{Written for commit bc0d38c. 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-050-add-png-to-pdf-converter-capability

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