Update plugins to new sensors API

[Butakus]

This PR adapts all plugins to the new API after the refactor in EasyNavigation/EasyNavigation#94.

• The paths have changed: Perception classes now live under easynav_sensors instead of easynav_common.
• Most plugins used the "points" NavState key as a way to get all point clouds. Now sensors live independently of groups. I updated the code to get the list of points from the "points" group, so the rest of the logic is the same. The new NavState API ofr groups returns a vector of perceptions the same way the point clouds were stored in the "points" key, so the change is minimal. Beware that the group key must be explicitly set in the YAML config file, as it is not set by default.

Please do not merge until and unless the core PR is approved!

[fmrico]

I have more changes here. I will do it as soon as #94 is finished

[codecov]

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✅ All modified and coverable lines are covered by tests.

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[fmrico]

merging!! 🚀