Merge "DocumentsUI: Declare intents for App enumeration" into rvc-dev am: 5a192ad6ad am: 6115954035

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

Change-Id: I30acba1e60a56921b50e030e6d46abb43419b69d