feat: add uid type (#74)

Co-authored-by: Milap Sheth <milap@interoplabs.io>

.changeset/hip-ears-act.md

@@ -0,0 +1,5 @@
+---
+'@axelar-network/axelar-cgp-sui': patch
+---
+
+Added UID type

src/index.ts

@@ -1,3 +1,4 @@
 export * from './bcs';
 export * from './tx-builder';
 export * from './utils';
+export * from './types';

src/types.ts

@@ -0,0 +1,7 @@
+const { bcs } = require('@mysten/sui.js/bcs');
+const { fromHEX, toHEX } = require('@mysten/bcs');
+
+export const UID = bcs.fixedArray(32, bcs.u8()).transform({
+    input: (id: string) => fromHEX(id),
+    output: (id: number[]) => toHEX(Uint8Array.from(id)),
+});