[ros2_control_node] Add the realtime_tools lock_memory method to prevent page faults (backport #1822)

[mergify]

Add lock_memory to avoid page faults and lock the memory at the beginning to physical RAM

---

This is an automatic backport of pull request #1822 done by Mergify.

[mergify]

Cherry-pick of e6e69c1 has failed:

On branch mergify/bp/iron/pr-1822
Your branch is up to date with 'origin/iron'.

You are currently cherry-picking commit e6e69c1.
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Changes to be committed:
	modified:   controller_manager/src/ros2_control_node.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   doc/release_notes.rst

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.34%. Comparing base (13aed56) to head (fd9103d).
Report is 1 commits behind head on iron.

Files with missing lines	Patch %	Lines
controller_manager/src/ros2_control_node.cpp	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             iron    #1851      +/-   ##
==========================================
- Coverage   62.35%   62.34%   -0.01%     
==========================================
  Files         112      112              
  Lines       13098    13102       +4     
  Branches     8883     8886       +3     
==========================================
+ Hits         8167     8169       +2     
+ Misses        949      946       -3     
- Partials     3982     3987       +5     

Flag	Coverage Δ
unittests	62.34% <50.00%> (-0.01%)	⬇️

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	76.92% <50.00%> (-3.08%)	⬇️

... and 2 files with indirect coverage changes