get non zero byte slice from non zero borrowed array in const context

[hubcycle]

Provide const method to convert NonZeroEmpty<&[u8; N]> to NonZeroEmpty<&[u8]>.

Description

Add the following method:

impl<'a, const N: usize> NonEmptyBz<&'a [u8; N]> {
	/// Converts a `NonEmptyBz<&[u8; N]` to NonEmptyBz<>.
	pub const fn as_slice(&self) -> NonEmptyBz<&'a [u8]> {
		todo!("implementation")
	}
}