Redirecting hide call from IMMS to client

Instead of calling directly into hideCurrentInputLocked, we should call
setImeVisibilityOnFocusedWindowClient, to make sure that the hide
request is synced with InsetsController.

Bug: 298172246
Test: atest CtsInputMethodTestCases
Flag: android.view.inputmethod.refactor_insets_controller
Change-Id: I84b3b26ad0099c7ef3f1ecb4278c800ccee71bcf