chore(object_velocity_splitter): rework parameters

[kminoda]

Description

Add a parameter file.
Must be merged with autowarefoundation/autoware_launch#820

Tests performed

• Launched a node individually and confirmed that it loads the parameter as expected
• Launch Autoware with perception_mode = radar, and confirmed that the velocity_threshold is loaded as 5.5.
• Launch Autoware with perception_mode = lidar_radar_fusion, and confirmed that the velocity_threshold is loaded as 4.5.
• Launch Autoware with perception_mode = camera_lidar_radar_fusion, and confirmed that the velocity_threshold is loaded as 4.5.

Effects on system behavior

No effect expected

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b1a414) 14.40% compared to head (0952fa2) 14.62%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6158      +/-   ##
==========================================
+ Coverage   14.40%   14.62%   +0.22%     
==========================================
  Files        1906     1868      -38     
  Lines      129849   126937    -2912     
  Branches    37572    37044     -528     
==========================================
- Hits        18699    18566     -133     
+ Misses      90156    87504    -2652     
+ Partials    20994    20867     -127     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	14.62% <ø> (+0.22%)	⬆️	Carriedforward from 54f1796

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[scepter914]

LGTM