Create a REST API endpoint that returns mock data about an IP address. It accepts the following:
- An IP address (returns data for the IP address) (restricted by permission and removed once T261555 is completed)
- A log ID (returns data about the associated IP address, if the performer was anonymous)
- A revision ID (returns data about the associated IP address, if the editor was anonymous)
The endpoint will return data for anon actions (and may return data for logged in users if the user has the proper permission, like checkuser, see T261555).