lanes associated const for SimdValue

[aentity]

is possible we can have associated const LANES for wide types? Or for example in SimdValue:

trait SimdValue {
  const LANES: usize;
}

This will be very useful in generic context and working with arrays.

For example:

if we have:

type WIDE = simba::simd::WideF32x4;
type WIDET = f32;

for slice in data.chunks(WIDE::LANES) {
  let arr: [WIDET; WIDE::LANES] = slice.try_into().unwrap();
  let wide = WIDE::from(arr);
}

we can now easily switch the wide type, put in generics, or change wide amount to experiment for performance. today simba::simd::WideF32x4::lanes() is trait fn, and cannot be const.

if yes, i will attempt to make PR, thank you