Checkout and reset (hard and soft) by relative commit

[spigelli]

• The checkout modal could have an option to switch to a tree view, displaying local and remote trees (through github integration), where the user could select a commit to checkout based on commit id or message
• The same modal could be displayed for resets, allowing HEAD to be reset interactively

I'd be interested in submitting PRs for this or publishing it as its own tool so let me know if it fits with the goal of the project