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.

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[codecov[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/autowarefoundation/autoware.universe/pull/9332/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=autowarefoundation) | Coverage Δ | | *Carryforward flag | |---|---|---|---| | [differential](https://app.codecov.io/gh/autowarefoundation/autoware.universe/pull/9332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=autowarefoundation) | `6.68% <20.00%> (?)` | | | | [total](https://app.codecov.io/gh/autowarefoundation/autoware.universe/pull/9332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=autowarefoundation) | `29.82% <ø> (ø)` | | Carriedforward from [fbf297a](https://app.codecov.io/gh/autowarefoundation/autoware.universe/commit/fbf297afa91d394a32c9183fcef1c788269b778d?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=autowarefoundation) | *This pull request uses carry forward flags. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=autowarefoundation) to find out more.

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