Expand array sizes through U1024 (#46)

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

This extends the allowed array sizes through U1024 in multiples of 16,
although that still won't be enough to cover all cases.

However, it's the current limit of what `typenum` provides convenient
type aliases for.

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
 }