Add AsyncFunctionHandlerParams initialization through ROS parameters

[saikishor]

I've added a way to initialize the current parameter from the ROS nodes directly, much easier when using with nodes and controllers

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.53%. Comparing base (cb06c3e) to head (9d6a237).

Files with missing lines	Patch %	Lines
.../include/realtime_tools/async_function_handler.hpp	62.50%	3 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
- Coverage   86.62%   85.53%   -1.10%     
==========================================
  Files          17       17              
  Lines        1391     1438      +47     
  Branches      117      133      +16     
==========================================
+ Hits         1205     1230      +25     
- Misses        111      121      +10     
- Partials       75       87      +12     

Flag	Coverage Δ
unittests	85.53% <70.96%> (-1.10%)	⬇️

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

Files with missing lines	Coverage Δ
...ealtime_tools/test/test_async_function_handler.cpp	100.00% <100.00%> (ø)
.../include/realtime_tools/async_function_handler.hpp	75.36% <62.50%> (-6.91%)	⬇️

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[christophfroehlich]

in principle LGTM.

Do you plan to update ros-controls/ros2_control#2477 with this?

[saikishor]

in principle LGTM.

Do you plan to update ros-controls/ros2_control#2477 with this?

Not really
I've just added it for future purposes. Maybe for the controller interface class