feat(tier4_planning_rviz_plugin): move footprint plugin to path

[purewater0901]

Description

Move footprint plugin into the path plugin in the tier4_planning_rviz_plugin directory.

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The PR reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.

After all checkboxes are checked, anyone who has write access can merge the PR.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (e7089d7) 11.98% compared to head (d4e3437) 11.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2971      +/-   ##
==========================================
- Coverage   11.98%   11.97%   -0.02%     
==========================================
  Files        1318     1318              
  Lines       91504    91641     +137     
  Branches    24240    24240              
==========================================
  Hits        10970    10970              
- Misses      69172    69309     +137     
  Partials    11362    11362              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	11.99% <ø> (+<0.01%)	⬆️	Carriedforward from e7089d7

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

Impacted Files	Coverage Δ
...ier4_planning_rviz_plugin/include/path/display.hpp	0.00% <ø> (ø)
...planning_rviz_plugin/include/path/display_base.hpp	0.00% <0.00%> (ø)
...on/tier4_planning_rviz_plugin/src/path/display.cpp	0.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[takayuki5168]

LGTM