feat(freespace_planner): add processing time pub

[Kazunori-Nakajima]

Description

The processing time of freespace_planner was measured and made to Pub.

(TIER IV internal usecase)
This output is then read by the Basic scenario and tested daily for cycle failures.

Related links

How was this PR tested?

ros2 topic echo /planning/scenario_planning/parking/freespace_planner/debug/processing_time_ms

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 29.81%. Comparing base (fbf297a) to head (96c79d0).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
...oware_freespace_planner/freespace_planner_node.cpp	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9332      +/-   ##
==========================================
- Coverage   29.82%   29.81%   -0.01%     
==========================================
  Files        1338     1339       +1     
  Lines      103205   103231      +26     
  Branches    40213    40228      +15     
==========================================
+ Hits        30778    30779       +1     
- Misses      69442    69467      +25     
  Partials     2985     2985              

Flag	Coverage Δ		*Carryforward flag
differential	6.68% <20.00%> (?)
total	29.82% <ø> (ø)		Carriedforward from fbf297a

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