Deprecating ResultsReceiver usage in InputMethodManager

Previously, the ResultReceiver was passed to InputMethodManager#{show,hide}SoftInput and send along to IMS. With the changes of [1], requests from IMM are forwarded to InsetsController, where the resultReceiver was not passed, as we only send the requestedVisibleTypes to the system.
With the changes of this CL, we notify the resultReceiver in InputMethodManager, before passing the request to InsetsController.

Reason for deprecating:
The ResultReceiver is not reliable to be used for determining whether the IME is shown or not. The recommended usage would be to set a View.OnApplyWindowInsetsListener, which is invoked whenever the IME will show.

[1]: I8e3a74ee579f085cb582040fdba725e7a63d6b85

Test: blaze test \
      --android_platforms=//buildenv/platforms/android:armeabi-v7a,//buildenv/platforms/android:arm64-v8a \
      --config=android_local_adb \
      --nocache_test_results \
      --test_arg=--install_test_services \
      --test_arg=--install_basic_services \
      --runs_per_test=1 \
      //javatests/com/google/android/apps/gmail/espresso:AccountSetupTest_hub_as_gmail_dev_offline_sapi_appcompat_master
Bug: 372199387
Flag: android.view.inputmethod.refactor_insets_controller
Change-Id: I6031229f2069e565360100a9a166c34272dcaff6