Debug render contact normals

[Jondolf]

Objective

Currently, only contact points can be debug rendered. It'd be useful to support rendering contact normals.

Solution

Add contact normal debug rendering. The old contact_color and similar configuration options have been renamed like contact_point_color.

I also fixed the arrow gizmo that previously sometimes rendered the tip with an incorrect orientation. When Bevy 0.13 is released, it can be replaced with the built-in arrow gizmo.

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Changelog

• Renamed PhysicsDebugConfig properties and methods like contact_foo to contact_point_foo
• Added corresponding contact_normal_foo properties and methods
• Removed With<Collider> filter from debug_render_contacts
• Fixed arrow gizmo

Migration Guide

• Change PhysicsDebugConfig properties and methods like contact_foo to contact_point_foo