feat(trajecotry_follower,trajecotry_follower_nodes): add constant acc

[taikitanaka3]

Description

• add contant velocity controller for psim testing

Related links

experiment-2022-10-20_19.43.46.mp4

Tests performed

by psim

because psim doesn't have any limitation for velocity or acceleration this will keeps accelerating
https://user-images.githubusercontent.com/65527974/195523927-aff283ed-2659-43cb-991b-3c69839a796b.mp4

Notes for reviewers

Dont merge this

this PR needs this change and set option constant
tier4/autoware_launch#514

    # longitudinal controller mode
    add_launch_arg(
        "longitudinal_controller_mode",
        "constant",
        "longitudinal controller mode: `pid` or `constant`",
    )

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (beta/v0.5.3@aee2610). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff               @@
##             beta/v0.5.3     #149   +/-   ##
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  Coverage               ?   42.29%           
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  Files                  ?       54           
  Lines                  ?     3769           
  Branches               ?     1918           
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  Hits                   ?     1594           
  Misses                 ?      679           
  Partials               ?     1496           

Flag	Coverage Δ
differential	42.23% <0.00%> (?)

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