Call Screening / Caller ID API Changes

- Fix bug in call identification parcelable; was reversing the app name
and package name.
- Add @hide RoleManager consts for the Telecom roles; this will be
replaced by values in the library for public consumption as a later
date.
- Add new call direction attribute to the Call.Details class; this is
needed so that a CallScreeningService can know if a call is incoming
or outgoing.  This way it knows whether it needs to perform call blocking
or just caller ID.
- Update CallScreeningService API docs to explain how to request the
call screening role.
- Update InCallService API docs to explain the 3 roles related to this
service and how you declare an appropriate IncallService to fill each of
them.

Bug: 63966743
Test: Manual, CTS
Merged-In: Ic4547b8ead791690305f7be58e43272c4155b7fb
Change-Id: Ic4547b8ead791690305f7be58e43272c4155b7fb