Remove old joint state and joint command handles

[jordan-palacios]

Remove all trace to hardware_interface::JointStateHandle and hardware_interface::JointCommandHandle.

Requires #125 and ros-controls/ros2_controllers#90.

Closes #125.

[codecov-commenter]

Codecov Report

Merging #134 into master will decrease coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
- Coverage   37.25%   36.61%   -0.64%     
==========================================
  Files          44       42       -2     
  Lines        1863     1726     -137     
  Branches     1136     1080      -56     
==========================================
- Hits          694      632      -62     
+ Misses        130      100      -30     
+ Partials     1039      994      -45     

Flag	Coverage Δ
#unittests	36.61% <ø> (-0.64%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...face/include/hardware_interface/robot_hardware.hpp	50.00% <ø> (ø)
hardware_interface/src/robot_hardware.cpp	53.84% <ø> (-0.10%)	⬇️
...e_interface/test/test_robot_hardware_interface.cpp	53.48% <ø> (+6.50%)	⬆️
test_robot_hardware/src/test_robot_hardware.cpp	31.74% <ø> (-3.61%)	⬇️

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[destogl]

@jordan-palacios do you need this for ros-controls/ros2_controllers#90? Is this ready for review?

@bmagyar @Karsten1987 I would propose to merge this one and then start porting to new Joint and Sensor components from #121. In this way, we would have smaller PRs and can track changes easily.

[jordan-palacios]

@jordan-palacios do you need this for ros-controls/ros2_controllers#90? Is this ready for review?

Yes. As soon as ros-controls/ros2_controllers#90 is merged. You can review it meanwhile if you like.