Add ContactDataHandler to convert CP2 contacts to Person objects Add classes to handle data from CP2 to AppSearch: 1) Added two appsearchtypes ContactPoint and Person 2) Added ContactDataHandler to handle different mime types 3) Added ContactDataHandlerTest One Pager: go/appsearch-contacts-indexer-one-pager Design doc: go/appsearch-contacts-indexer(Implementation Plan: https://docs.google.com/document/d/1qfek20XQQYh02V2J6K0pXfrhnXYmVH-1NqwI8Xiqd10/edit#heading=h.8tlk1jy5d7ek) Prototype: ag/16130927 Bug: 203605504 Test: atest ContactDataHandlerTest Change-Id: Id21bd349f0cde409aaead891f1c9baa31f090545