support all types of animation interpolation from gltf (#10755)
# Objective
- Support step and cubic spline interpolation from gltf
## Solution
- Support step and cubic spline interpolation from gltf
Tested with
https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/InterpolationTest
expected:
result:
---
## Migration Guide
When manually specifying an animation `VariableCurve`, the interpolation
type must be specified:
- Bevy 0.12
```rust
VariableCurve {
keyframe_timestamps: vec![0.0, 1.0, 2.0, 3.0, 4.0],
keyframes: Keyframes::Rotation(vec![
Quat::IDENTITY,
Quat::from_axis_angle(Vec3::Y, PI / 2.),
Quat::from_axis_angle(Vec3::Y, PI / 2. * 2.),
Quat::from_axis_angle(Vec3::Y, PI / 2. * 3.),
Quat::IDENTITY,
]),
},
```
- Bevy 0.13
```rust
VariableCurve {
keyframe_timestamps: vec![0.0, 1.0, 2.0, 3.0, 4.0],
keyframes: Keyframes::Rotation(vec![
Quat::IDENTITY,
Quat::from_axis_angle(Vec3::Y, PI / 2.),
Quat::from_axis_angle(Vec3::Y, PI / 2. * 2.),
Quat::from_axis_angle(Vec3::Y, PI / 2. * 3.),
Quat::IDENTITY,
]),
interpolation: Interpolation::Linear,
},
```
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