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 64.86486% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.42%. Comparing base (2cf4b74) to head (dcca6db).

Files with missing lines	Patch %	Lines
.../include/realtime_tools/async_function_handler.hpp	56.66%	5 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
- Coverage   86.61%   85.42%   -1.20%     
==========================================
  Files          17       17              
  Lines        1390     1441      +51     
  Branches      117      135      +18     
==========================================
+ Hits         1204     1231      +27     
- Misses        111      121      +10     
- Partials       75       89      +14     

Flag	Coverage Δ
unittests	85.42% <64.86%> (-1.20%)	⬇️

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	74.87% <56.66%> (-7.40%)	⬇️

... and 1 file with indirect coverage changes

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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

[christophfroehlich]

LGTM