Describe the feature or problem you’d like to solve

gh issue create is excellent, and I love being able to write issues using $EDITOR. I would also like to comment on issues using the same workflow.

Proposed solution

gh issue comment #123 would behave similarly to gh issue create. The CLI would open $EDITOR, and submit the comment after $EDITOR closes.

Using $EDITOR to type longer comments is awesome!

Additional context

When we do this we should make it available for both issues and pull requests.