feat(behavior_path_planner): change method to combine drivable lanes

[takayuki5168]

Description

We have to combine drivable lanes from the multiple modules when the number of running modules is larger than 1.
I separated the implementation into generateDrivableLanes which depends on each module and combineDrivableLanes which can be used for any module.

In the near future, I will move combineDrivableLanes outside the module so that there will be no conflict of drivable area generation with any pairs of modules.

• TODO
  • planning simulator with old archi
  • planning simulator with new archi by @satoshi-ota

Tests performed

with BT: https://evaluation.tier4.jp/evaluation/reports/fb9bd427-c48a-5203-92fa-7723d1ca0aa4?project_id=prd_jt
without BT: planning simulator works well with avoidance/lane change.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.06 ⚠️

Comparison is base (145de9f) 12.41% compared to head (bb0989c) 12.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3249      +/-   ##
==========================================
- Coverage   12.41%   12.35%   -0.06%     
==========================================
  Files        1364     1364              
  Lines       95145    96250    +1105     
  Branches    27066    27816     +750     
==========================================
+ Hits        11812    11892      +80     
- Misses      70909    71843     +934     
- Partials    12424    12515      +91     

Flag	Coverage Δ		*Carryforward flag
differential	5.55% <0.00%> (?)
total	12.41% <ø> (-0.01%)	⬇️	Carriedforward from 33a3b33

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

Impacted Files	Coverage Δ
...rc/scene_module/lane_change/lane_change_module.cpp	0.00% <ø> (ø)
...ehavior_path_planner/src/util/lane_change/util.cpp	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

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[satoshi-ota]

LGTM