Feature Request: MR comments in the Web IDE
### Proposal
It would be really great if MR comments were exposed in the Web IDE for viewing/adding/replying/etc... This allows for [low-context communication](https://about.gitlab.com/company/culture/all-remote/effective-communication/#understanding-low-context-communication) when addressing feedback rather than needing to open the MR in one window/tab and the Web IDE in another window/tab, and switching between the two.
issue