`as_vec3a` for `Vec3`

[Aceeri]

What problem does this solve or what need does it fill?
A couple of times I've expected a method like Vec3::as_vec3a to exist when I'm flipping between simd/non simd, but it seems you have to use Vec3A::from(vec3);. Seems a little bit counterintuitive to how to convert between all the other types.

Describe the solution you'd like
Add Vec3::as_vec3a() that just does Vec3A::from(vec3)

Describe alternatives you've considered
Using From/Into if there is some reasoning behind this.

[bitshifter]

The as_* methods specifically use the as keyword to cast the vector from one scalar type to another, for example Vec3::as_dvec3 casts from f32 as f64. Vec3A and Vec3 are both vectors of f32 so I don't think an as_vec3a is appropriate here.

Perhaps a Vec3::to_vec3a()? There are already similar methods like to_array.

[Aceeri]

I think that'd be fine, but maybe a bit less discoverable for the average user using the library, though I understand the rationale.

Just feels a bit odd that you can throw an .as_vec3a() for a DVec3, but if you start using Vec3, itd be .to_vec3a()