fix(vehicle_velocity_converter): simpify parameter inputs

[kminoda]

Signed-off-by: kminoda koji.m.minoda@gmail.com

Description

I propose to simplify the parameter input of vehicle_velocity_converter. Since the 6x6 matrix input is too redundant, the node should be provided with only two essential values, the standard deviation of vx and wz.

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[codecov]

Codecov Report

Merging #1727 (95e7dcf) into main (74e28ed) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1727      +/-   ##
==========================================
- Coverage   10.25%   10.25%   -0.01%     
==========================================
  Files        1204     1204              
  Lines       86697    86706       +9     
  Branches    20020    20020              
==========================================
  Hits         8894     8894              
- Misses      68541    68550       +9     
  Partials     9262     9262              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	10.24% <0.00%> (ø)		Carriedforward from b8a1f85

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

Impacted Files	Coverage Δ
..._velocity_converter/vehicle_velocity_converter.hpp	0.00% <ø> (ø)
...ocity_converter/src/vehicle_velocity_converter.cpp	0.00% <0.00%> (ø)

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[YamatoAndo]

I think the 6x6 matrix would be fine as its input, but I would like to respect your opinion.