Filter methods

[foarsitter]

When I'm filtering on an amount I want to include null values. This involves an or_.

I modified the filter method so it checks if there is a filter method defined, i.e:

class ProductFilter(Filter):
    costs__lte: int | None = Field(None)

    def filter_costs__lte(self, value: Any, query: Union[Query, Select]) -> Union[Query, Select]:
        return query.filter(
            or_(
                Product.costs <= value,
                Product.costs == null()
            )
        )

I can provide a PR when this is the way you want to go.

Thanks for providing this library!

[github-actions[bot]]

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