Update CPU affinity parameter to be able to set multiple CPUs

[saikishor]

This PR changes the strategy on handling CPU affinity. The changes here allow to use multiple CPUs instead of a single one as in previous implementation

Similar approach as #1898

[saikishor]

@firesurfer Can you take a look at the changes?

[firesurfer]

Apart from the missing documentation update this looks fine!

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 87.75%. Comparing base (3d57fc8) to head (9b588e9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
controller_manager/src/ros2_control_node.cpp	10.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1915      +/-   ##
==========================================
- Coverage   87.83%   87.75%   -0.08%     
==========================================
  Files         122      122              
  Lines       12926    12939      +13     
  Branches     1153     1155       +2     
==========================================
+ Hits        11353    11355       +2     
- Misses       1148     1158      +10     
- Partials      425      426       +1     

Flag	Coverage Δ
unittests	87.75% <10.00%> (-0.08%)	⬇️

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

Files with missing lines	Coverage Δ
controller_manager/src/ros2_control_node.cpp	66.66% <10.00%> (-9.93%)	⬇️

... and 1 file with indirect coverage changes

[christophfroehlich]

Should we update that in the release notes?

[saikishor]

Should we update that in the release notes?

Yes! You are right. I forgot that part 😅😅

[christophfroehlich]

Thanks!