PR review improvements

[foxieproducts]

Hi all,

I've been using the extension to do Bitbucket PR reviews for a little while and there are a handful of things I've noticed that would make it more useful:

1. In the listing of files changed, a "viewed" checkbox would be helpful (web UI has this)
2. When viewing individual files, it would be nice to have a button to collapse/expand all comments
3. There doesn't seem to be a "Resolve" button for comments (web UI has this)
4. A "all files changed" scrolling view (web UI has this)
5. To avoid an email for every comment, the ability to "Start review", add all the comments, then "Finish Review" (web UI has this)
6. Ability to create "draft" PR (web UI has this)

Additionally, I encountered issues with trying to become authenticated from a VSCode Remote session. I ended up having to close all VSCode windows and then open a local session to get it to work.

Thanks for all your team does!