Use AwareDateTime when generating field from DateTime(timezone=True)

Nobody has claimed this yet.

I didn't investigate this. I don't know if there would be an issue with this.

Basically, when I have a model with

```py
creation_date = sqla.Column(sqla.DateTime(timezone=True), nullable=False)
```

I need to override the auto field in the schema

```py
class ItemSchema(AutoSchema):
class Meta:
model = Item

id = msa.auto_field(dump_only=True)
creation_date = ma.fields.AwareDateTime(required=True)
```

I suppose this could be automatized.

The issue names no files or tests. Start by tracing AutoSchema's auto_field generation for SQLAlchemy DateTime(timezone=True) and compare it with the shown AwareDateTime override. Confirm the expected generated field and its coverage before deciding whether automation is appropriate.

Written by the indexing model from the issue text.