static type checking

[grillazz]

options are: mypy, pyright, pyre

[am1ter]

Hello! I'm not sure if I need to mention this here, but in case it's helpful to anyone, if you want to use MyPy with Alchemy 2.0, you'll need to modify the Base model class. Specifically, replace @declared_attr with @declared_attr.directive. Referance here