Dashboard client polyscopex (backport #1546)

[mergify]

Adds support for the new Robot API coming with PolyScope 10.11.0. It serves as a replacement of the PolyScope 5 Dashboard Server, though functionality is currently limited to

• Loading a program
• Changing the program state
• Fetching the current Program state
• Changing the robot's state

This requires UniversalRobots/Universal_Robots_Client_Library#392

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This is an automatic backport of pull request #1546 done by Mergify.

[mergify]

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Changes to be committed:
	modified:   ur_robot_driver/include/ur_robot_driver/dashboard_client_ros.hpp
	modified:   ur_robot_driver/src/dashboard_client_ros.cpp
	modified:   ur_robot_driver/test/dashboard_client.py
	modified:   ur_robot_driver/test/test_common.py

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   ur_robot_driver/doc/dashboard_client.rst

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally