Add face struct, ecore event, handler, and TCs

Add face struct, ecore event, handler, and TCs

This patch is added handlers about face recognizer event,
and initializes this event variable.
By this patch's added test cases, it can check face recognizer event type is working and, multi input modalities can be registered.

Change-Id: Ibb185d5d925756d41654e918d2a1d95b19317f1e