Forward class creation keyword arguments

[smac89]

https://docs.python.org/3/library/functions.html#type

I wanted to be able to create a template model which other models inherit from and modify, by passing keyword arguments in the class definition. However, the current implementation of ModelBase does not pass along those arguments which results in errors like

TypeError: ModelBase.__new__() got an unexpected keyword argument 'custom_arg'

---

Example code:

Base class

class Foo(pw.Model):
    foo_type: pw.CharField

    @classmethod
    def __init_subclass__(
        cls, foo_type_default: str
    ) -> None:
        cls.foo_type = pw.CharField(
            choices=(
                ("bar", "Bar"),
                ("foobar", "Foobar"),
            ),
            default=foo_type_default,
        )

Subclass1

class Bar(Foo, foo_type_default="bar"):
    pass

Subclass2

class FooBar(Foo, foo_type_default="foobar"):
    pass

With the current implementation, the above doesn't work. This PR fixes that.

[coleifer]

Sure, I've merged an equivalent patch w/just the 79 char line limit.

[smac89]

That was easy. Thanks!

When do you think a new release will be available?

[coleifer]

There's hardly any fixes, I think it may need a bit of time.