support/num_traits: Move out of support.

[github-actions]

On 2023-10-13 @prestwich wrote in 0fdcd4d “Merge pull request #329 from DaniPopes/const-bytes”:

Move out of support.

    fn checked_rem(&self, other: &Self) -> Option<Self> {
        <Self>::checked_rem(*self, *other)
    }
}

// TODO: Move out of support.
impl<const BITS: usize, const LIMBS: usize> Shl<u32> for Uint<BITS, LIMBS> {
    type Output = Self;

    #[inline(always)]
    fn shl(self, rhs: u32) -> Self::Output {

From src/support/num_traits.rs:128