feat(behavior_path_planner): add start shift length

[purewater0901]

Signed-off-by: yutaka purewater0901@gmail.com

Description

Add start shift length to enable it to have shift length at the start point of the segment of the shifted segment.

Related links

Tests performed

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[codecov]

Codecov Report

Base: 10.40% // Head: 10.36% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (6b158ba) compared to base (4e080d2).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2050      +/-   ##
==========================================
- Coverage   10.40%   10.36%   -0.05%     
==========================================
  Files        1169     1169              
  Lines       83592    83967     +375     
  Branches    19591    19857     +266     
==========================================
- Hits         8700     8699       -1     
- Misses      65384    65706     +322     
- Partials     9508     9562      +54     

Flag	Coverage Δ		*Carryforward flag
differential	2.85% <0.00%> (?)
total	10.38% <0.00%> (-0.01%)	⬇️	Carriedforward from 4e080d2

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

Impacted Files	Coverage Δ
...r/scene_module/avoidance/avoidance_module_data.hpp	0.00% <0.00%> (ø)
...r_path_planner/scene_module/utils/path_shifter.hpp	0.00% <ø> (ø)
...er/src/scene_module/avoidance/avoidance_module.cpp	0.00% <0.00%> (ø)
...ner/src/scene_module/avoidance/avoidance_utils.cpp	3.12% <0.00%> (ø)
..._path_planner/src/scene_module/avoidance/debug.cpp	0.00% <0.00%> (ø)
...planning_evaluator/src/planning_evaluator_node.cpp	37.11% <0.00%> (-1.04%)	⬇️

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[purewater0901]

internal test 823/825

https://evaluation.tier4.jp/evaluation/reports/91e183d6-aff5-5eec-8323-5f09bbfd2dc7?project_id=prd_jt