Function smoothstep

smoothstep(edge0: number, edge1: number, x: number): number
Smoothstep interpolation - smoother than linear interpolation
Parameters
- edge0: number
  Lower edge
- edge1: number
  Upper edge
- x: number
  Input value
Returns number
Smoothly interpolated value in [0, 1]
Example
```
smoothstep(0, 1, 0.5); // ~0.5 but with smooth curve
```
- Defined in src/core/math/utils.ts:154