print async thread pinned cores (backport #551)

[mergify]

_{The tinyest of PRs}

following this one and this review comment.
as part of thread renaming PR accross ros2_control and realtime_tools

Just prints the PCU cores we pinned on.

---

This is an automatic backport of pull request #551 done by Mergify.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.71%. Comparing base (ba3a700) to head (f02d258).

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy     #567      +/-   ##
==========================================
- Coverage   83.75%   83.71%   -0.05%     
==========================================
  Files          19       19              
  Lines        1539     1541       +2     
  Branches      147      147              
==========================================
+ Hits         1289     1290       +1     
- Misses        154      155       +1     
  Partials       96       96              

Flag	Coverage Δ
unittests	83.71% <100.00%> (-0.05%)	⬇️

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Files with missing lines	Coverage Δ
.../include/realtime_tools/async_function_handler.hpp	72.35% <100.00%> (+0.25%)	⬆️

... and 1 file with indirect coverage changes

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