feat: return created comment in add functions

[samerickson]

Description

• Added return statement to return the created comment in both comment creation helper functions

Related Issues

Checklist

• I have read and followed the contribution guidelines.
• I have tested my changes locally.
• I have updated documentation accordingly (if necessary).
• I have added unit and E2E tests (if applicable).

Additional Notes

[samerickson]

Note that if the area and editor members were protected and not private I would also be able to get this behaviour by extending the CommentPlugin class with my required changes.

[rete-js]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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