evas: Implement evas map support in eo as a mixin

evas: Implement evas map support in eo as a mixin

It relies a bit on evas legacy APIs and will only work on
evas objects (Efl.Canvas.Object) for now.

The main difference with Evas_Map is that there is no
separate map object, as the functions apply directly to
any canvas object.

For convenience, most functions will automatically populate
the map if there was no previous map info. While this may
be convenient, the object's size changes still need to
be tracked to update the map info.