Command palette: add compare

[johnkors]

Hi!

I use the compare url quite a bit to be able to do a review over what will become the latest release before deployment:

1. Get the latest release/tag
2. Open the compare URL: main vs latest tag

Would be nice if there was a quick(er) more user friendly way to do it, other than just modifying the URL (source: github docs)

To compare different versions of your repository, append /compare to your repository's path.

For example, if the command palette had a compare command in some fashion (and/or if there was an actually link somewhere in the UI to do it).

[jpmcd]

I constantly wonder about this too. Pretty much every time I want to compare two branches or different commits on the same branch. Then I have to look up how to modify the URL while thinking "Why isn't there an easier way to do this?"