refactor(path_optimizer): rename package name and fix trajectory visualizer

[kosuke55]

Description

obstacle_avoidance_planner -> path_optimizer

related to:
https://github.com/orgs/autowarefoundation/discussions/4741

fix some tools to work

Related links

Tests performed

Notes for reviewers

Interface changes

Effects on system behavior

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[kosuke55]

@takayuki5168
could you please approve this PR?

[kosuke55]

@TakaHoribe @satoshi-ota please approve

[sasakisasaki]

Perhaps motion_velocity_smoother in this line is not used in the recent Autoware. As far as I see, velocity_smoother is maybe the right one.

[kosuke55]

@sasakisasaki
thanks! but this PR is for rename of path_optimizer, so I would like to it as it is.

[yhisaki]

In trajectory_visualizer.py Line 332-333.

        if self.update_traj_final:
            self.im10.set_data([0], [self.localization_vx])
            self.im11.set_data([0], [self.vehicle_vx])