fix: add encode to identity

Fix API unintentional API change introduced by #160 which removed `encode` method.

Author: Gozala

src/hashes/identity.js

@@ -4,11 +4,16 @@ import * as Digest from './digest.js'
 const code = 0x0
 const name = 'identity'
 
+/**
+ * @param {Uint8Array} input
+ * @returns {Uint8Array}
+ */
+const encode = (input) => coerce(input)
+
 /**
  * @param {Uint8Array} input
  * @returns {Digest.Digest<typeof code, number>}
  */
 const digest = (input) => Digest.create(code, coerce(input))
 
-/** @type {import('./interface').SyncMultihashHasher<typeof code>} */
-export const identity = { code, name, digest }
+export const identity = { code, name, encode, digest }