Allow construction of `const_class` with strict types and kwargs

[whiskeyo]

With such code:

import constclasses as cc

@cc.const_class(with_strict_types=True)
class Widget:
    first: int
    second: int

widget = Widget(first=10, second=20)

Python throws an error constclasses.ccerror.InitializationError: Invalid number of arguments: expected 2 - got 0.

Extending the const_class decorator with with_kwargs=True in such way:

import constclasses as cc

@cc.const_class(with_strict_types=True, with_kwargs=True)
class Widget:
    first: int
    second: int

widget = Widget(first=10, second=20)

seems to solve the problem, but then the Widget cannot be created without using named arguments, e.g. with widget = Widget(1, 2), since it throws:

E   TypeError: Attribute value does not match the declared type:
E       attribute: first, declared type: <class 'int'>, actual type: <class 'NoneType'>

Could the constclasses.const_class be somehow extended to support both named and unnamed arguments, so the same class can be reused?