[A11y Focus API] Add new API implementation to RemoteInputView

The addition of a new View#requestRectangleOnScreen API in ag/31686664
and the corresponding update to TextView#bringPointIntoView meant that
the RemoteInputView#requestRectangleOnScreen implementation was not
being called. This adds an implementation of the new
requestRectangleOnScreen API that calls into the existing API so that
TextView#bringPointIntoView calls the correct implementation in
RemoteInputView.

Flag: android.view.accessibility.request_rectangle_with_source
Bug: 391877896
Bug: 405120787
Bug: 417507823
Test: Manually tested locally with and without flag
Change-Id: Ia1c09fd828adf6c530b94357aa84d39337d85036