FR status bar click action: Show diff

[GitMensch]

In most cases this is what I'm interested in (and also would use in online editors): show the change of this commit in this file in a vscode read-only diff.

[Sertion]

Hey. Thanks for the issue.

I've looked into this a few times, but I am not able to find a good/easy way to show a diff in vscode. The reason I went with the git show in terminal route was because it was simple and works for most people.