refactor!: use the same conversion system for hybrids and columns

fix: insert missing create_type in union conversion

Breaking Change: convert_sqlalchemy_type now uses a matcher function
Breaking Change: convert_sqlalchemy type's column and registry arguments must now be keyword arguments
Breaking Change: convert_sqlalchemy_type support for subtypes is dropped, each column type must be explicitly registered
Breaking Change: The hybrid property default column type is no longer a string. If no matching column type was found, an exception will be raised.

Signed-off-by: Erik Wrede <erikwrede2@gmail.com>

Author: erikwrede