refactor(raw_vehicle_cmd_converter): refactor csv loader

[taikitanaka3]

Description

• refactor raw vehicle cmd converter

100% tests passed, 0 tests failed out of 5

Label Time Summary:
copyright     =   1.68 sec*proc (1 test)
cppcheck      =   0.38 sec*proc (1 test)
gtest         =   0.10 sec*proc (1 test)
lint_cmake    =   0.35 sec*proc (1 test)
linter        =   3.13 sec*proc (4 tests)
xmllint       =   0.71 sec*proc (1 test)

Total Test time (real) =   3.22 sec
Finished <<< raw_vehicle_cmd_converter [3.44s]

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[codecov]

Codecov Report

Base: 10.41% // Head: 10.44% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (d1a07ef) compared to base (4be6931).
Patch coverage: 45.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2074      +/-   ##
==========================================
+ Coverage   10.41%   10.44%   +0.03%     
==========================================
  Files        1171     1171              
  Lines       83579    83648      +69     
  Branches    19578    19629      +51     
==========================================
+ Hits         8704     8738      +34     
- Misses      65369    65380      +11     
- Partials     9506     9530      +24     

Flag	Coverage Δ		*Carryforward flag
differential	5.49% <30.00%> (?)
total	10.39% <28.57%> (ø)		Carriedforward from db6d493

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

Impacted Files	Coverage Δ
...ehicle/raw_vehicle_cmd_converter/src/brake_map.cpp	22.22% <16.66%> (+4.36%)	⬆️
.../raw_vehicle_cmd_converter/src/steer_converter.cpp	37.66% <20.00%> (+3.81%)	⬆️
...ehicle/raw_vehicle_cmd_converter/src/accel_map.cpp	25.75% <42.85%> (+6.52%)	⬆️
...hicle/raw_vehicle_cmd_converter/src/csv_loader.cpp	51.28% <56.52%> (-2.57%)	⬇️
...r/include/raw_vehicle_cmd_converter/csv_loader.hpp	100.00% <100.00%> (ø)

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[TakaHoribe]

super great