Migrate InputMethodService to WindowProviderService

Also introduce IWindowManager#getDisplayIdToLaunchIme to make IMS
be aware of the launched display to prevent extra onConfigurationChanged
callback

Bug: 149463653
Test: atest MultiDisplaySystemDecorationTests CtsInputMethodTestCases
Test: atest ContextTest ContextIsUiContextTest
Test: manual - moving IME between 2 displays and displayArea within
      display - config change received
Test: manual - the app to show IME crashed and focus is set to the
      next task - no config change

Change-Id: Ie565e30ed5dd3f2cfe27355a6dded76dc3adc14b