Set grid size for :py:class:`GridEnvironment` which manager is in
        given address.

        :param str mgr_addr: Address of the manager agent

        :param gs:
            New grid size of the grid environment, iterable with length 2.

async def set_gs(self, mgr_addr, gs):
        '''Set grid size for :py:class:`GridEnvironment` which manager is in
        given address.

        :param str mgr_addr: Address of the manager agent

        :param gs:
            New grid size of the grid environment, iterable with length 2.
        '''
        remote_manager = await self.env.connect(mgr_addr)
        await remote_manager.set_gs(gs)