feat: add UINT_* constants

Author: vbrvk

src/constants.ts

@@ -1,8 +1,10 @@
 export const UINT_8_MAX = (1n << 8n) - 1n
 export const UINT_24_MAX = (1n << 24n) - 1n
+export const UINT_16_MAX = (1n << 16n) - 1n
 export const UINT_32_MAX = (1n << 32n) - 1n
 export const UINT_40_MAX = (1n << 40n) - 1n
 export const UINT_48_MAX = (1n << 48n) - 1n
+export const UINT_64_MAX = (1n << 64n) - 1n
 export const UINT_80_MAX = (1n << 80n) - 1n
 export const UINT_160_MAX = (1n << 160n) - 1n
 export const UINT_128_MAX = (1n << 128n) - 1n