Add Skeleton3D and AnimationTree benchmarks

[Calinou]

These benchmarks represent stress tests that challenge the CPU with lots of animation calls.

This also adds a default environment that makes it easier to distinguish objects from the background, even when there is no light in the scene.

Thanks to @mrjustaguy for providing a base for these benchmarks as part of godotengine/godot#93568 and godotengine/godot#101494 🙂

Note

supplemental/human.scn contains the model data, so it's saved as a binary format to reduce file size and improve load/save times.

[fire]

How does one review this?

[Calinou]

How does one review this?

I suppose you can run the new benchmarks locally and look at the scripts, but that's probably it.

[fire]

Todo list

• Check if the humanoid is similar to SkeletonProfileHumanoid
• Check if there's an alternative skeleton that's not a human. Like mechanical or foilage.