[Bug] model modifier does not use base class type hints to cast value to correct type

[pa-hqt]

Bug Description

If I inherit from a base class the method typer.get_type_hints does not include the type hints of the properties that are defined in the base class. As a result, the properties are not casted to correct data type when used with unicorn:model="property" in template.
In my case it was an HTML select, where the option values are numerical IDs that are always transmitted as strings and should be converted in the unicorn component.

Suggested fix: change line type_hints = typing_get_type_hints(obj) in django_unicorn.typer.get_type_hints to

if hasattr(obj, "__class__"):
    # Should be called with class object (instead of instance) to get type hints of parent classes. From docs:
    # "If obj is a class C, the function returns a dictionary that merges annotations from C’s base classes with those on C directly.
    # This is done by traversing C.__mro__ and iteratively combining __annotations__ dictionaries." (https://docs.python.org/3/library/typing.html#typing.get_type_hints)
    type_hints = typing_get_type_hints(obj.__class__)
else:
    type_hints = typing_get_type_hints(obj)

External references:
https://discuss.python.org/t/behavior-of-get-type-hints-differs-on-classes-and-instances/70491
https://docs.python.org/3/library/typing.html#typing.get_type_hints

Expected behaviour

If I have defined data type hints in a base class of my current view, these type hints should be considered when the property, that is defined in the base class, is set in child view via the unicorn:model mechanism. (at least for primitive data types)

Screenshots / Screenrecords

N/A

Steps to reproduce

from django_unicorn.components import UnicornView
from django_unicorn.typer import get_type_hints


class BaseView(UnicornView):
    base_property: int = 0


class ChildView(BaseView):
    child_property: int = 0


# Tests that fail
def test_set_property_value_with_casting():
    view = ChildView(component_name="test", component_id="test_get_type_hints_base_class")

    view._set_property("child_property", "1")  # value is transmitted as string, but should be an int
    assert view.child_property == 1, "child_property should be of type int and have value 1"  # works as expected

    view._set_property("base_property", "1")  # value is transmitted as string, but should be an int
    assert view.base_property == 1, "base_property should be of type int and have value 1"  # fails, because no type hint is returned for the base class properties


def test_get_type_hints_base_class():
    expected = {"base_property": int, "child_property": str}
    actual = get_type_hints(ChildView(component_name="test", component_id="test_get_type_hints_base_class"))
    assert actual == expected

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