Expand array sizes through U1024

Post-quantum schemes like Kyber/Saber require sizes larger than what is
currently supported.

This extends the allowed array sizes through U1024, stepping by
multiples of 16,  although that still won't be enough to cover all
cases needed for Kyber/Saber.

However, it's the current limit of what `typenum` provides convenient
type aliases for. Beyond that we'll either need to define our own types
/ type aliases.

src/sizes.rs

@@ -5,12 +5,12 @@ use super::{ArraySize, AssocArraySize};
 macro_rules! impl_array_size {
     ($($len:expr => $ty:ident),+) => {
         $(
-            unsafe impl ArraySize for typenum::$ty {
+            unsafe impl ArraySize for typenum::consts::$ty {
                 type ArrayType<T> = [T; $len];
             }
 
             impl<T> AssocArraySize for [T; $len] {
-                type Size = typenum::$ty;
+                type Size = typenum::consts::$ty;
             }
         )+
      };
@@ -280,13 +280,46 @@ impl_array_size! {
     320 => U320,
     336 => U336,
     352 => U352,
+    368 => U368,
     384 => U384,
+    400 => U400,
+    416 => U416,
+    432 => U432,
     448 => U448,
+    464 => U464,
+    480 => U480,
+    496 => U496,
     512 => U512,
+    528 => U528,
+    544 => U544,
+    560 => U560,
+    576 => U576,
+    592 => U592,
+    608 => U608,
+    624 => U624,
+    640 => U640,
+    656 => U656,
+    672 => U672,
+    688 => U688,
+    704 => U704,
+    720 => U720,
+    736 => U736,
+    752 => U752,
     768 => U768,
+    784 => U784,
+    800 => U800,
+    816 => U816,
+    832 => U832,
+    848 => U848,
+    864 => U864,
+    880 => U880,
     896 => U896,
-    1024 => U1024,
-    2048 => U2048,
-    4096 => U4096,
-    8192 => U8192
+    912 => U912,
+    928 => U928,
+    944 => U944,
+    960 => U960,
+    976 => U976,
+    992 => U992,
+    1008 => U1008,
+    1024 => U1024
 }