Implement Sample for byte arrays

[HEnquist]

This implements the Sample trait for byte arrays of length 2, 3, 4, 8 and 16, which should cover the byte representation of all common numerical formats. I added a simple test to show it working, not sure if it's placed where it belongs.

[udoprog]

Cheers! Any particular reason you don't want to make it generic over its length?

[HEnquist]

No reason except that I didn't think of it 😋

[HEnquist]

Does Sample really need Default?
I tried redoing the byte arrays with const generics and got stuck on missing Default since there is no generic implementation for arrays yet, only for a number of fixed lengths (up to 32 I think).
I tried just removing that Default bound here:

audio/audio-core/src/sample.rs

Line 13 in dae9e00

pub unsafe trait Sample: Copy + Default {

All tests still pass. Am I missing something or could that Default stay gone?

[udoprog]

Feel free to remove it. I think the ZERO associated type already serves that purpose and is more correct. All though its documentation is not great.

[HEnquist]

Good, Default stays gone then. I pushed a new version of this with generic length.

[udoprog]

Cheers!