migrate twitter4j.http.* to twitter4j.auth.*

classes in twitter4j.http.* are all about authentication/authorization, but they are in http.* package for the historical reasons.
It'll be clearer for new users if they're in twitter4j.auth.* package.

on version 2.1.13, mark those classes in http.* as deprecated, and introduce classes in auth.* which inherit classes in http.*.
on version 2.2.0, remove http.* and everything will be in auth.*.