include create_type in pg.ENUM.adapt; test all attrs

include create_type in pg.ENUM.adapt; test all attrs

Fixed apparently very old issue where the
:paramref:`_postgresql.ENUM.create_type` parameter, when set to its
non-default of ``False``, would not be propagated when the
:class:`_schema.Column` which it's a part of were copied, as is common when
using ORM Declarative mixins.

Fixes: #9773
Change-Id: I79a7c6f052ec39b42400d92bf591c791feca573b