Move interop data for each year to separate files and endpoints

[DanielRyanSmith]

See: https://github.com/web-platform-tests/wpt.fyi/pull/2944#discussion_r971334589

Currently the Interop 20XX data exists in a large json file interop-data.json with data for all years. It would be useful for organization to store the data in separate files for each year and/or create an endpoint that can pull the data for a specific year.