Support receiving touch event in the inline suggestion view

* Before this change, the suggestionRoot would intercept all touch
  events so that it can optionally forward them to the IME process
  to support scrolling, no touch event will be sent to the child
  view through the regular event dispatching process.
* With this change, we move the touch event transferring (to IME)
  logic from SuggestionRoot's onTouchEvent to dispatchTouchEvent.
  Now the touch events before a scroll is detected will be sent to
  the child chip view, and only the touch events after a scroll is
  detected will be sent to the IME.
* This patch also move the OnClickListener and OnLongClickListener
  from the root view to the chip view, since the touch events now
  either goes to the chip view or to the IME process.
* Note that in order to achieve this, given that we can't change
  the API, and there is existing OnLongClickListener registered
  to the chip view, we have to add a @hide API to the View to
  get the existing OnLongClickListener and attach a new one to the
  chip view, such that we can do the additional work of sending
  the long click event to IME, when the view is long clicked.
* This patch should also fix the a11y talkback mode bug where
  double-tapping on the view doesn't autofill the value.
  Double-tap and hold also works that it triggers the attribution
  dialog.

Test: atest CtsAutoFillServiceTestCases (sanity test)
Bug: 155245913
Bug: 154149807

Change-Id: I6f7be1ea5c0955969abb4ccae0cb421423095c4d