Move IME related API methods from IMM to IMS.

InputMethodManager is public InputMethod API for apps. The methods
that take Window-token as parameter are restricted to system
and/or IME developers. Such methods should really live
in InputMethodService.
This CL deprecates such methods in IMM and moves them to IMS.

This is the first step towards simplifying IME APIs.

Bug: 70282603
Test: atest InputMethodManagerTest
Change-Id: I3163f3cbe557c85103ca287bee0874a3b4194032