feat: add sncrypto client side packages

packages/sncrypto-common/src/AES-GCM/Aes256GcmEncrypted.ts

@@ -0,0 +1,17 @@
+import { Base64String } from '../Types/Base64String'
+import { HexString } from '../Types/HexString'
+
+/**
+ * @param iv initialization vector as a hex string
+ * @param tag authentication tag as a hex string
+ * @param ciphertext as a base64 string
+ * @param encoding that will be applied after decrypting
+ * @param aad additional authenticated data as a hex string
+ */
+export type Aes256GcmEncrypted<EncodingType> = {
+  iv: HexString
+  tag: HexString
+  ciphertext: Base64String
+  encoding: EncodingType
+  aad: HexString
+}