Merge "DocumentsUI: Declare intents for App enumeration" into rvc-dev am: 5a192ad6 am: 78ce50f0 am: e1bfb58d am: eedfd08e am: d4935659

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

Change-Id: Ic153dc434bc75268de1c50385de1be9f75dd45eb