feat: add cgroup setter node

[TetsuKawa]

Description

This PR adds cgroup setter node which attach processes to your custom cgroup.

Related links

Tests performed

• Confirmed that this node attach processes to some custom cgroups.
• Confirmed that this node output error logs when it fail to write attach processes to a cgroup, pgrep fail to find a pid, or the config file is wrong.
• Confirmed that this node publish proper /diagnostics.

Notes for reviewers

Assumptions, Write permission is required for a custom cgroup, and /sys/fs/cgroup/cgroup.procs to attach a PID to the cgroup.

Interface changes

ROS Topic Changes

ROS Parameter Changes

Effects on system behavior

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 97 lines in your changes missing coverage. Please review.

Project coverage is 14.97%. Comparing base (f36005b) to head (7ff7a64).
Report is 972 commits behind head on main.

Files	Patch %	Lines
system/cgroup_setter/src/cgroup_setter.cpp	0.00%	97 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6977      +/-   ##
==========================================
- Coverage   14.98%   14.97%   -0.02%     
==========================================
  Files        1933     1934       +1     
  Lines      133069   133166      +97     
  Branches    39707    39730      +23     
==========================================
  Hits        19940    19940              
- Misses      90907    91004      +97     
  Partials    22222    22222              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	14.98% <ø> (ø)		Carriedforward from f36005b

*This pull request uses carry forward flags. Click here to find out more.

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[mitsudome-r]

@TetsuKawa @ito-san Do you still need this modification?