refs: gitkraken/vscode-gitlens#2576

This PR #169621 stopped providing TimelineItem instances in the callback of commands on items. GitLens was reliant on that to provide additional features on GitTimelineItems, e.g. Open Commit on Remote.

I was trying to see if there was a way to still provide this GL feature, but now the only thing returned in the callback is a Uri to the file -- not a git: url with the sha or any other context.

Can the Uri that is returned be a qualified git: scheme Uri with the SHA embedded, or better yet some additional context object that would provide more details on the timeline item itself (so this wouldn't be specific for just Git based timeline entries)?

Thanks!

/cc @jrieken @lramos15