Add missing effort controller dependency.

[JacobJBeck]

Ran into issues due to missing ros-humble-effort-controllers, so I've added that package as a dependency.

[tpoignonec]

Hi!

Actually, fd_hardware defines a ros2control hardware interface, so it is independent from the actual controller used.

An explicit dependency in fd_description would make sense, although looking at the package now, it seems we put everything in fd_bringup so far... (e.g., joint_state_publisher).

Besides, it should be an "exec_depend", not a "depend", because the controller is just a plugin loaded at runtime.

@JacobJBeck ros-humble-effort-controllers was the only missing dependency on a clean distro ?

[tpoignonec]

This dep was added to the list (#16 ).