refactor(autoware_traffic_light_multi_camera_fusion): split utils and add test

[MasatoSaeki]

Description

Split file to perform the test and add unit test.

Related links

Parent Issue:

• Link

How was this PR tested?

Evaluator

Unit Test

colcon build --merge-install --symlink-install --packages-up-to autoware_traffic_light_multi_camera_fusion --cmake-args -DCMAKE_BUILD_TYPE=Debug

colcon test --merge-install --packages-select autoware_traffic_light_multi_camera_fusion --event-handlers console_cohesion+

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 71.05263% with 11 lines in your changes missing coverage. Please review.

Project coverage is 25.67%. Comparing base (9b671b5) to head (b7ecbf6).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...on/src/traffic_light_multi_camera_fusion_utils.cpp	80.00%	6 Missing ⚠️
...ion/src/traffic_light_multi_camera_fusion_node.cpp	0.00%	3 Missing ⚠️
...on/src/traffic_light_multi_camera_fusion_utils.hpp	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10360      +/-   ##
==========================================
+ Coverage   25.64%   25.67%   +0.02%     
==========================================
  Files        1360     1362       +2     
  Lines      104750   104758       +8     
  Branches    39853    39915      +62     
==========================================
+ Hits        26868    26896      +28     
+ Misses      75271    75249      -22     
- Partials     2611     2613       +2     

Flag	Coverage Δ		*Carryforward flag
differential	2.47% <71.05%> (?)
differential-cuda	2.47% <71.05%> (?)
total	25.65% <ø> (+<0.01%)	⬆️	Carriedforward from 7f8b36f

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

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