control-systems

Is your feature request related to a problem? Please describe.
ParameterSpace objects seem to have downgraded in importance and are at the moment mainly used to generate sets of parameter samples in parameter values dicts. However, in doing so, they are little flexible, as only methods for uniform and random sampling exist.

Describe the solution you'd like
Common sampling techniqu

Background

On the last WG meeting it was decided to force use of get_node() getter in controllers. For this node_ member should be made private.

To solve this issue two PR should be openend:

-[ ] on ros2_control repository: node_ member is private and tests are updated t

Current docstring contents are not sufficient. Every function, regardless of trivialness, require at least one usage example.