Tries to parse the Lambda Function name from the Integration defined in the method configuration.
        Integration configuration is defined under the special "x-amazon-apigateway-integration" key. We care only
        about Lambda integrations, which are of type aws_proxy, and ignore the rest. Integration URI is complex and
        hard to parse. Hence we do our best to extract function name out of integration URI. If not possible, we
        return None.

        Parameters
        ----------
        method_config : dict
            Dictionary containing the method configuration which might contain integration settings

        Returns
        -------
        string or None
            Lambda function name, if possible. None, if not.

def _get_integration_function_name(self, method_config):
        """
        Tries to parse the Lambda Function name from the Integration defined in the method configuration.
        Integration configuration is defined under the special "x-amazon-apigateway-integration" key. We care only
        about Lambda integrations, which are of type aws_proxy, and ignore the rest. Integration URI is complex and
        hard to parse. Hence we do our best to extract function name out of integration URI. If not possible, we
        return None.

        Parameters
        ----------
        method_config : dict
            Dictionary containing the method configuration which might contain integration settings

        Returns
        -------
        string or None
            Lambda function name, if possible. None, if not.
        """
        if not isinstance(method_config, dict) or self._INTEGRATION_KEY not in method_config:
            return None

        integration = method_config[self._INTEGRATION_KEY]

        if integration \
                and isinstance(integration, dict) \
                and integration.get("type") == IntegrationType.aws_proxy.value:
            # Integration must be "aws_proxy" otherwise we don't care about it
            return LambdaUri.get_function_name(integration.get("uri"))