IME should notify autofill

Notify autofill always even if the IME doesn't support
InlineSuggestions. This is useful to decide whether IME is showing
up for fill dialog to make the decision to show.

Bug: 377868687
Flag: android.service.autofill.improve_fill_dialog_aconfig
Test: atest CtsAutoFillServiceTestCases
      atest CtsInputMethodTestCases
Change-Id: I6e15b1044a1060bafb31a36a829a197b2f2566c4