Add View.onReceiveContent() and View.getOnReceiveContentMimeTypes()

Added View.onReceiveContent() which will invoke the callback if one
is set.

Added View.getOnReceiveContentMimeTypes() to return the MIME types
that the view can receive, removing the getSupportedMimeTypes()
method from the callback interface.

Changed the code to pass MIME types as a String[] instead of a
Set<String> in order to:
* Avoid repeated conversion from Set to array in
onCreateInputConnection.
* Avoid misleading users of the API into using contains() to compare
MIME types (ClipDescription.compareMimeTypes should be used in order to
correctly handle wilcards such as "image/*").

Bug: 170191676
Bug: 152068298
Test: atest CtsViewTestCases:ViewTest
Test: atest CtsViewTestCases:ViewOnReceiveContentTest
Test: atest CtsWidgetTestCases:TextViewOnReceiveContentCallbackTest
Test: atest FrameworksCoreTests:TextViewOnReceiveContentCallbackTest
Test: atest FrameworksCoreTests:AutofillValueTest
Change-Id: Id0c7f8f5fd3c7c44827a62dba1b2b205433e7540