Missing Vector3 methods to be added

The following methods in `Vector3` have yet to be added:

- [x] `distance(self, other: Self) -> f64` -- Returns the distance between two vectors.

- [x] `slerp` -- Spherical lerp

- [ ] `ortho_normalize(normal: &mut Vector3, tangent: &mut Vector3, binormal: Vector3)` -- Normalizes `normal`. Normalizes `tangent` and makes sure it is orthogonal to `normal`. Normalizes `binormal` and makes sure it is orthogonal to both `normal` and `tangent`.

- [x] `project` -- Projects a vector onto another vector

- [ ] `project_on_plane` -- Projects a vector onto a plane defined by a normal orthogonal to the plane.

- [ ] `rotate_towards` -- Rotates a vector towards a target