chore(obstacle_velocity_limiter): publish processing time as float

[TakaHoribe]

Description

Use Float64 msg for processing time as other planning modules do.

Tests performed

run psim

Effects on system behavior

None

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c508aa7) 14.76% compared to head (4fd429e) 14.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5257      +/-   ##
==========================================
- Coverage   14.76%   14.76%   -0.01%     
==========================================
  Files        1644     1644              
  Lines      113948   113949       +1     
  Branches    35160    35161       +1     
==========================================
  Hits        16824    16824              
  Misses      78179    78179              
- Partials    18945    18946       +1     

Flag	Coverage Δ		*Carryforward flag
differential	27.40% <0.00%> (?)
total	14.76% <ø> (+<0.01%)	⬆️	Carriedforward from c508aa7

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

Files	Coverage Δ
...ity_limiter/src/obstacle_velocity_limiter_node.cpp	16.33% <0.00%> (-0.11%)	⬇️

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