console.createInstance gets used by a lot of chrome code to do logging.

(Other chrome code sometimes uses Console.sys.mjs, but note bug 1430810, or Log.sys.mjs, which IMO should be removed or be a thin wrapper around console.createInstance. We probably want a separate bug for this if one does not exist.)

Anyway, it would be neat if MOZ_LOG captured the console.createInstance stuff. It already has a prefix prop that can be used for the "name" of the log module, so in theory, hopefully integration would be reasonably straightforward.

LogModile::Get() allows dynamic creation of log modules; if it doesn't exist it will create it.