Expose input area via imperative handle

[talum]

In order to properly insert suggestions, we need a reference to the textarea itself.

I'm working on implementing a "suggest changes" button in the draft MarkdownEditor, and I think that still belongs outside of the MarkdownEditor. We should be able to use some of the existing behavior as long as we expose a reference to the textarea.

Since we're already using useImperativeHandle, I added another property.

I want to be able to test a canary version of this before going through the release process 😄, so if y'all have advice about the failing check I would appreciate it.

Screenshots

n/a

Merge checklist

• [x] Added/updated tests
• [ ] Added/updated documentation
• [ ] Tested in Chrome
• [ ] Tested in Firefox
• [ ] Tested in Safari
• [ ] Tested in Edge

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Latest commit: e4c997b375c90eac3a4d36a6ecc71bc85b0ba844

The changes in this PR will be included in the next version bump.

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@primer/react	Minor

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[lesliecdubs]

👋🏻 @siddharthkp I think you reviewed the initial implementation of MarkdownEditor, is that right? Would you mind giving this a look?

[siddharthkp]

@talum oh yep, known issue: visual tests don't run on forks (secrets etc)

I invited you as a contributor so that you can directly create pull requests on the repo

[lesliecdubs]

👋🏻 @talum Hi! Were you able to put up a PR for this directly in the repo, or is this forked draft still relevant?

[talum]

Yeah, this work was reprioritized, so I was pulled off it. I'll close this out for now.