ecore_input: support ECORE_EVENT_MOUSE_FRAME event

ecore_input: support ECORE_EVENT_MOUSE_FRAME event

We add a new event and structure as below.
- Event: ECORE_EVENT_MOUSE_FRAME
- Struncture: Ecore_Event_Mouse_Frame

This event is generaged when the ecore_wl2 receives the wl_touch.frame or wl_pointer.frame event.
Through this event, clients can group and process the touch or mouse events.

For example,
toolkit which uses Ecore library can accumulate all ECORE_EVENT_MOUSE_DOWN/MOVE/UP events as
they're received, then process pending inputs when the ECORE_EVENT_MOUSE_FRAME event is received.

@tizen_only

Change-Id: Ia4c7446a1f3a03a688e518b3a88afa84cc5696bd