Paste multiple links into markdown via comment box

[imjohnbo]

Summary

👋 🦄 🐳 Hello! This pull request adds support for converting multiple links from an HTML copy source into a comment box upon paste. Previous copy/paste functionality is unchanged, e.g. when pasting a plaintext link onto a selection.

See GIF and internal tracking issue for more context 🍿 📺:

[koddsson]

These changes look good to me! I pushed some commits rather than making review comments. I hope that's OK. Let me know what you think of those changes, and if that's good, I can merge this and make a new release for you.

[imjohnbo]

These changes look good to me! I pushed some commits rather than making review comments. I hope that's OK. Let me know what you think of those changes, and if that's good, I can merge this and make a new release for you.

Woohoo! Your additional changes look wonderful to me ✨ except for one comment. TIL about dom.iterable to avoid Array.froming, and I do like the idea to push and then join an array rather than concatenate a string. Thanks for the quick review!