Make IInputMethodManager to oneway (2/N)

Make methods(await, logging) to utility in Completable
so that other modules could use them directly.

Bug: 163453493
Test: Manual test with keyboard
Test: atest CtsInputMethodTestCases
Change-Id: Idedb9de658de3e6e91afad16bab0c428ee68e7b3
2 files changed