feat: Copy a PNG image to the clipboard in addition to SVG data in suported browsers

[personalizedrefrigerator]

Summary

• Copies image/png data to the clipboard in addition to text/html or image/svg+xml data in browsers that support navigator.clipboard.write
• Refactors paste logic

To-do

• [x] Automated tests
• [x] Refactoring: move paste handling out of Editor.ts

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 4eeaaa9):

https://js-draw--pr60-work-copy-image-to-c-lo17besp.web.app

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