Google Code-in

Your task is twofold:

• Rebase this Gerrit patch onto the current master. This will be good practice in rebasing, an important skill when working with distributed version control systems like Git.
• Add support for change tagging to the following two API modules listed in https://phabricator.wikimedia.org/T97720: imagerotate, revisiondelete,. This involves adding a new parameter called tags, checking that the user is allowed to apply change tags, and then applying the tags themselves. ApiDelete as of this patch is a good model.