Add a quick plugin to inspect the render world's entities

[Davier]

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The new plugin is based on WorldInspectorPlugin, except that it show entities of the render world. These entities are cleared at the end of each frame, what is shown is their final state in the previous frame.

I removed the Resources and Assets sections for now. The WorldInspectorPlugin lists all reflected resources whether they exist or not, so it would need some change to avoid cluttering it with render-only resources (and the other way around).

I had to add a direct dependency on bevy_input to clone the input resource into the render world.

The result is underwhelming for now since no render components are reflected, but it's a good start.