ability to add MR comment for specific file and line
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### Problem to solve
Maybe it's already possible with glab, but I really searched through the documentation and the issues, multiple times, and I just couldn't find it. What I'd like would be to be able to enter a comment for a merge request, for a specific file and line of code. So not a comment on the general merge request, but for a specific line of code that was touched by the MR.
I would plug in this my editor for fast editing, as the browser is really slow when reviewing large merge requests and review is quite painful. That way I could review from my text editor and get a much more snappy user experience.
### Proposal
I would expand `glab mr note` to add flags `--file` and `--line` to say where to attach the note to. Although --line probably should also allow a line range line start:end.
### Further details
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For instance, this is such a note in this repo:
https://gitlab.com/gitlab-org/cli/-/merge_requests/1127#note_1207698223
It's tied to a specific file and line number in the diff of the MR.
### Links / references
https://gitlab.com/gitlab-org/cli/-/blob/main/docs/source/mr/note.md
Same feature request for the github cli:
https://github.com/cli/cli/issues/359
I apologize again if it's already implemented, but I really couldn't find it...
epic