Add more PR comment interaction

**Is your feature request related to a problem? Please describe.**
When doing a code review and it's currently not possible for me to see if a comment had already been resolved in VS Code or if it's still open. Also, it's not possible to see if a comment is already outdated because of more recent code pushes.

**Describe the solution you'd like**
Seeing the resolved status of a PR comment in VS Code directly and resolving / reopening a comment directly from IDE would help very much.

**Describe alternatives you've considered**
Currently doing reviews via browser only partly in the IDE because it's not possible only from IDE.

**Additional context**
Also, some indication of outdated comments, like in browser, would be nice, but this is most likely a new ticket.

No file or test is named in the issue. Start by tracing the existing pull-request comment entry points in the TypeScript VS Code extension and compare their data with the browser's resolved and outdated states. Done means users can see status and resolve or reopen comments directly in VS Code, with the outdated indication treated as part of the requested scope.

Written by the indexing model from the issue text.