Implement new ephemeral resolver design

In the new design, the ephemeral installer can be returned from
queryIntentActivities which means any intent resolution could potentially
return the installer. Additionally, the new design calls for a platform
defined broadcast receiver that receives the status from the ephemeral
installer. This receiver then starts the final intent -- either to launch
the ephemeral application or to launch the fallback.

For more detail, see go/ephemeral-design

Change-Id: I6644bbb4f180d2d22c63af04b9857577516344a9