cherry-pick: Support cherry-pick multiple commits

Currently, the GitLab page only supports cherry-picking one commit at a time. However, there are times when users might want to cherry-pick a range, similar to what git cherry-pick A..B does: it cherry-picks all the commits from A to B onto the current commit. This feature could be useful, and as far as I know, Gerrit may have a similar capability where you can specify an optional base commit. I haven't delved into the details, but I believe this should be something that GitLab can provide.