Add a raw "order by" clause to the query

        :param sql: The raw clause
        :type sql: str

        :param bindings: The bdings
        :param bindings: list

        :return: The current QueryBuilder instance
        :rtype: QueryBuilder

def order_by_raw(self, sql, bindings=None):
        """
        Add a raw "order by" clause to the query

        :param sql: The raw clause
        :type sql: str

        :param bindings: The bdings
        :param bindings: list

        :return: The current QueryBuilder instance
        :rtype: QueryBuilder
        """
        if bindings is None:
            bindings = []

        type = "raw"

        self.orders.append({"type": type, "sql": sql})

        self.add_binding(bindings, "order")

        return self