Move activity client operations to a separate interface

This CL focuses on the methods used by Activity and ActivityThread.

Also remove getUriPermissionOwnerForActivity, notifyActivityDrawn
notifyLaunchTaskBehindComplete notifyEnterAnimationComplete
because they are only used between ATMS and WMS.

Bug: 174041144
Bug: 174040691
Test: CtsWindowManagerDeviceTestCases

Change-Id: I5a30ec30cf6acd9ae4c908e524141fd17a4e54ff