Allow sending of bulk Uri change notifications.

MediaProvider makes heavy use of Uri change notifications, which
currently need to be delivered one at a time through the Binder
interface.  To optimize this, allow callers to provide a collection
of multiple Uris to notify with a single Binder call.

Bug: 134170767
Test: atest cts/tests/tests/content/src/android/content/cts/ContentResolverTest.java
Change-Id: Ifef778e88bb772b5580f70929c6f2e9c166d1c0e