[API Feature Request] Update PR comments APIs to support commenting on any line

[amr]

🏷️ Discussion Type

Product Feedback

💬 Feature/Topic Area

API

Body

Hi,

I hope you can consider bringing the comment on any line feature along to the respective PR review/comments APIs on REST and/or GraphQL. The current parity gap makes for a frustrating user experience for any client that uses the API to offer github integration.

[github-actions[bot]]

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