Feat: Implement Pod trait on Uint types

[0xKitsune]

Motivation

This PR implements the Pod trait on Uint types where the size is a multiple of 64, up to 1024. This allows Uint types within this range to be used in instances where a Pod trait bound exists.

Solution

This implementation uses a simple macro to implement the Pod trait on the following Uint sizes listed below.

macro_rules! impl_pod {
    ($(($bits:expr, $limbs:expr)),+ $(,)?) => {
        $(
            unsafe impl Pod for Uint<{$bits}, $limbs> {}
        )+
    };
}


impl_pod! {
    (64, 1),
    (128, 2),
    (192, 3),
    (256, 4),
    (320, 5),
    (384, 6),
    (448, 7),
    (512, 8),
    (576, 9),
    (640, 10),
    (704, 11),
    (768, 12),
    (832, 13),
    (896, 14),
    (960, 15),
    (1024, 16),
}

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[prestwich]

is it possible to replace this with a generic_const_expr usage when cfg(feature = "nightly") ?

[0xKitsune]

Can you provide more insight on what this might look like? I can take a look into updating the implementation to use generic_const_expr when nightly is enabled.

Would you want this updated before merging the current changes?

[0xKitsune]

Just following up on this, let me know what you think. I'm happy to take a look into it if this would be blocking to get the PR merged.

[prestwich]

i don't consider this a blocker

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (d92ca5a) 82.66% compared to head (d4abbcc) 82.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
+ Coverage   82.66%   82.67%   +0.01%     
==========================================
  Files          52       53       +1     
  Lines        5648     5681      +33     
==========================================
+ Hits         4669     4697      +28     
- Misses        979      984       +5     

Files Changed	Coverage Δ
src/lib.rs	81.05% <ø> (ø)
src/support/bytemuck.rs	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[prestwich]

nit: these are really literal, as non-literal expr are invalid in this context. no change needed