public eSIM APIs created in Android P

This CL public following APIs:

EuiccManager#EXTRA_FORCE_PROVISION: used to identify whether the user
wants to start eSIM activation flow in Setup Wizard or not.

EuiccService#ACTION_BIND_CARRIER_PROVISIONING_SERVICE: used to bind
carrier app to get activation code for eSIM profile downloading.

Bug: 76121595
Bug: 119234674
Test: TreeHugger
Change-Id: Iddfc98937d5aa8d049a2a483790a689f44978b07