autofill: touch on IME should not close autofill

ag/3434666 causes a regression:
Before ag/3434666, autofill gets touch event after IME, autofill
close itself if it gets ACTION_OUTSIDE touch event.
But after ag/3434666, autofill intercepts touch events before IME, if
user touches within IME, autofill still gets ACTION_OUTSIDE event,
and close itself unexpectedly.

The fix moves the closing code to ViewRootImpl.EarlyPostImeStage
around the same place closing tooltip.

If user taps outside autofill window, we will force to close window,
even last autofillid that requestShowUi does not match.

Bug: 73796497
Test: atest CtsAutoFillServiceTestCases
Test: Added LoginActivityTest.testAutofillTapOutside
Test: manually tested using IME and sample app
TODO: need a fake IME service to dispatch given key upon touch.

Change-Id: I10fc0d29dc30d29a48b2118264ec1c4375062deb