✏️ Fix pydantic invalid when table=True(#1036)

[monchin]

I found that when table=True is set, pydantic becomes invalid for usage like hero = Hero(name="Deadpond", secret_name="Dive Wilson", age="test"). As the document says you get all of Pydantic's features, including automatic data validation, serialization, and documentation. You can use SQLModel in the same way you can use Pydantic., I think table=True makes pydantic invalid is a bug, so I tried to fix it.

I delete a test case because this case is incompatible with pydantic. I also add a test case to ensure my code works. For current code, my new test case would fail, but it would pass for my new code.