Collision shapes created through CollisionObject2D APIs are not visible

[udit]

Godot version: 3.2

OS/device including version: Windows 10

Issue description: Collision shapes created using CollisionObject2D APIs work but are not visible on enabling "Visible Collision Shapes".

Steps to reproduce: Create collision shape using shape_owner* APIs

	var own = create_shape_owner($Child)
	var shape = CircleShape2D.new()
	shape.radius = 20
	shape_owner_add_shape(own, shape)

Minimal reproduction project:
CollisionVisibilityBug.zip

[Xrayez]

CircleShape2D (and any other shape) are resources so they can't be drawn outside the scene tree if they weren't assigned via CollisionShape2D node in editor which actually enables editor/in-game visibility on them.

When you add those shapes via shape_owner* API (or even with Physics2DServer) it means that they are added to CollisionObject2D directly bypassing CollisionShape2D.

The solution might be that it's better to draw those shapes directly and not only via CollisionShape2D.

[Xrayez]

I have a PR which can help this on the scripting side: #37903, but doesn't solve the underlying issue.