Adds the frontend idp entity id to state
        See super class satosa.frontends.saml2.SAMLFrontend#save_state

        :type context: satosa.context.Context
        :type resp_args: dict[str, str | saml2.samlp.NameIDPolicy]
        :type relay_state: str
        :rtype: dict[str, dict[str, str] | str]

def _create_state_data(self, context, resp_args, relay_state):
        """
        Adds the frontend idp entity id to state
        See super class satosa.frontends.saml2.SAMLFrontend#save_state

        :type context: satosa.context.Context
        :type resp_args: dict[str, str | saml2.samlp.NameIDPolicy]
        :type relay_state: str
        :rtype: dict[str, dict[str, str] | str]
        """
        state = super()._create_state_data(context, resp_args, relay_state)
        state["target_entity_id"] = context.target_entity_id_from_path()
        return state