Merge "DocumentsUI: Declare intents for App enumeration" into rvc-dev am: 5a192ad6 am: 61159540 am: a551b746 am: 792ba228 am: 14ab7987

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/11860601

Change-Id: I4fd4e9d526439e185f34bd1c62fe4064c7e4b66b