📈 🎉 Pub joint temps

[cgeering]

Add joint temperature publishing capabilities to the ur_hardware_interface node.

Includes a new package -- ur_rtde_msgs -- for the joint temperatures message definition. Can move this into ChefAutonomy instead, but leaving in this repo for now.

Based off of these:

• Publish joint temperature UniversalRobots/Universal_Robots_ROS_Driver#446
• Rtde recipe publishing UniversalRobots/Universal_Robots_ROS_Driver#35

Testing:

• Build without failure
• Stack launch without failure
• Joint temps are published to ur_hardware_interface/joint_temperatures

[luisrayas3]

I think the main bit of testing I kinda want to see, but think we can skip for this PR, is checking the effect on the loop timing. Hopefully we don't do too much patching but if we do we may need to invest a bit of time on validating this

[cgeering]

I think the main bit of testing I kinda want to see, but think we can skip for this PR, is checking the effect on the loop timing. Hopefully we don't do too much patching but if we do we may need to invest a bit of time on validating this

Good point about the loop timing and agree that we should monitor this going forward.