api: rename efl.gfx.entity geometry events and add geometry data to those events

api: rename efl.gfx.entity geometry events and add geometry data to those events

the convention for event naming is to use $property,changed where possible
and to always emit related data with the event to reduce function calls

ref T7558

Reviewed-by: Marcel Hollerbach <marcel-hollerbach@t-online.de>
Differential Revision: https://phab.enlightenment.org/D7987

Change-Id: I71bb7e7a70349bd6d797263724fe185b435b345a