Adds boolean methods to u32x4 and u32x8

[andyquinterom]

Closes #160

[Lokathor]

This looks good so far, but you should puy a doc comment on each of these which explains what's going on

[mcroomp]

Do you think it would be cleaner to use the i32 versions of these since the implementation is identical, avoid code duplication ie:

   #[inline]
  #[must_use]
  pub fn move_mask(self) -> i32 {
    // no need to reinvent the wheel
    i32x4::move_mask(cast(self))
  }

  #[inline]
  #[must_use]
  pub fn any(self) -> bool {
    i32x4::any(cast(self))
  }

  #[inline]
  #[must_use]
  pub fn all(self) -> bool {
    i32x4::all(cast(self))
  }

  #[inline]
  #[must_use]
  pub fn none(self) -> bool {
    i32x4::none(cast(self))
  }

[Lokathor]

Yeah that's probably good.