Add context menu on commits in the HistorySidebar with add tag command

[DenisaCG]

Created a context menu for the commits showing inside the HistorySidebar and added a new command Add Tag.

Users can now right click on a commit and use the Add Tag command to directly create a tag pointing to that specific commit. Once clicking on the command, the NewTagDialogBox pops up, showing only the selected commit.

Screencast-Add-Tag-from-Context-Menu.webm

[github-actions]

👈 Launch a Binder on branch DenisaCG/jupyterlab-git/newTaginHistorySidebar

[fcollonval]

Thanks Denisa, I have only a single request. Would you mind not rendering the filter div when isSingleCommit == true in the NewTagDialog?

[DenisaCG]

Thank you for the review, Frédéric! And great point, I made the changes such that the filter input box disappears when adding a tag from the context menu. I'm also working on creating an integration test.

[fcollonval]

Thanks @DenisaCG