The tool to import entities from another wiki already exists but is only usable from a terminal. We want it to also be usable via a UI to make it more accessible.

This is an MVP with a very minimal feature set in order for us to see whether it is useful and usable to have such a tool.
Designs can be found here.

ACs

• We have curated a set of basic entities that are probably helpful for most wikis to get started with

*. that list is visible on a page in the documentation and is linked from the card in the settings

• when clicking the copy entities button, that set of entitites gets copied over to the wiki (who's settings the user was in when triggering the action)
• the button to copy the entities can only be triggered once per wiki. after having copied them over, the button is disabled and a message appears informing the user that copying can only happen once
• if copying worked, a success message appears
• if something went wrong (server issues, internet issues) an error message appears

Additional AC from Anton:

• Please make sure we have tracking in place to record which Wikibases actually attempted to use this feature (successfully and unsuccessfuly)