HarmonyOS 关于SM2签名设置自定义userid

参考：

let signer = cryptoFramework.createSign("SM2_256|SM3");
try {
  signer.setSignSpec(cryptoFramework.SignSpecItem.SM2_USER_ID_UINT8ARR, stringToUint8Array('1234567812345678'))
} catch (e) {
  console.error("设置签名参数error = " + e);
}
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参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-cryptoframework-V5#setsignspec10