feat: Added the ability to filter with the contains and icontains operators for fields with a data type other than string.

[SergeiVElfimov]

Added the ability to filter with the contains and icontains operators for fields with a data type other than string.

Example

class UserFilter(Filter):
    name: str | None = None
    name__contains: str | None = None
    name__icontains: str | None = None
    name__neq: str | None = None
    address: AddressFilter | None = FilterDepends(with_prefix("address", AddressFilter))
    age__lt: int | None = None
    age__gt: int | None = None
    age__contains: str | None = None # New filter
    age__icontains: str | None = None # New filter

    order_by: list[str] = ["age"]
    search: str | None = None

    class Constants(Filter.Constants):
        model = User
        search_model_fields = ["name"]