Use CollectionInfo and CollectionItemInfo api in RadioGroup and

RadioButton

Allow RadioGroups to be recognized as groups of
objects by accessibility services. This lays a foundation to better
describe these groups by exposing the number of buttons and the position of
each.

Bug: 144591511
Test: Tested on various app permission fragments in Settings and in the
time picker in Clock. Added cts tests.

Change-Id: Ie0c41d8c9b131ca29bba5387171a85dfdbb8db7e