Add support for taking a sequence of messages (#408)
Add support for taking a sequence of messages (#408)

* Add support for taking a sequence of messages

Signed-off-by: Michael Carroll <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@openrobotics.org>

* Update return types to address feedback

Signed-off-by: Michael Carroll <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@openrobotics.org>

* Restore comment

Signed-off-by: Michael Carroll <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@openrobotics.org>
ros2/rmw_connext,ros2/rmw_connext,ros2/rmw_connext