feat(crypto): add some new Hash module functions.

- updateString
- updateStringWithEncoding
- digestWithEncoding

NOTE: The second parameter of `digestWithEncoding` brings a new type `BinaryToTextEncodingThe.t`.

Author: muqiuhan

src/Crypto.res

@@ -31,6 +31,14 @@ KeyObject = {
   include Impl
 }
 
+module BinaryToTextEncoding = {
+  type t = string
+  let base64: t = "base64"
+  let base64url: t = "base64url"
+  let hex: t = "hex"
+  let binary: t = "binary"
+}
+
 module PivateKey = {
   include KeyObject.Impl
   type kind = [KeyObject.privateKey]
@@ -60,6 +68,9 @@ module Hash = {
     @send external copy: t => t = "copy"
     @send external digest: t => Buffer.t = "digest"
     @send external update: (t, Buffer.t) => unit = "update"
+    @send external updateString: (t, string) => t = "update"
+    @send external updateStringWithEncoding: (t, string, NodeJs.StringEncoding.t) => t = "update"
+    @send external digestWithEncoding: (t, BinaryToTextEncoding.t) => string = "digest"
   }
   include Impl
 }