feat(behavior_path_planner): support backward path drivable area

[kosuke55]

Description

Support backward path drivable area.

before

after

Related links

#2512

Tests performed

psim

Notes for reviewers

Interface changes

none

Effects on system behavior

none

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (76c61de) 14.18% compared to head (ec7acdb) 14.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4301   +/-   ##
=======================================
  Coverage   14.18%   14.18%           
=======================================
  Files        1599     1599           
  Lines      110048   110045    -3     
  Branches    31538    31537    -1     
=======================================
  Hits        15609    15609           
+ Misses      77485    77480    -5     
- Partials    16954    16956    +2     

Flag	Coverage Δ		*Carryforward flag
differential	13.58% <0.00%> (?)
total	14.18% <ø> (+<0.01%)	⬆️	Carriedforward from 76c61de

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

Impacted Files	Coverage Δ
...ning/behavior_path_planner/src/planner_manager.cpp	19.85% <0.00%> (ø)
...cene_module/start_planner/start_planner_module.cpp	4.03% <0.00%> (+0.02%)	⬆️

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[kosuke55]

#2512