Write ``value`` to memory at ``start_position``. Require that ``len(value) == size``.

def memory_write(self, start_position: int, size: int, value: bytes) -> None:
        """
        Write ``value`` to memory at ``start_position``. Require that ``len(value) == size``.
        """
        return self._memory.write(start_position, size, value)