Add a progress checkmark or similar in the compare view to track which files we have already finished comparing

[KevinMallinson]

When I am reviewing a large pull request, e.g. 200 files changed, it's easy to lose track of which files I have already reviewed.

It would be good if we could manually "mark" a file as "already reviewed", so we can easily distinguish which ones we have already reviewed.

[ChrisdeWolf]

I am also looking for this feature. I see vscode-github-pull-request extension has implemented something that would be perfect (link to original issue: microsoft/vscode-pull-request-github#520). I am generally just looking to check-off files I have already viewed when reviewing a large PR.

[github-actions]

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