feat:支持微信客服回调请求的校验和消息的解析，复用原有的Signature和DecryptMsg方法 (#439)

* 添加微信客服SDK

* polish:优化签名函数

* polish：优化注释内容

* polish:复用已有的Token以及CommonError,移除无用的输出

* polish:复用已有的消息加解密

* fix:修复错误信息被覆盖的问题

* polish:go fmt 文件

* polish:客服链接支持自定义参数并更新注释文档内容

* feat:支持微信客服回调请求的校验和消息的解析，复用原有的Signature和DecryptMsg方法

work/kf/error.go

@@ -21,6 +21,10 @@ const (
 	SDKInvalidCorpID Error = "无效的 CorpID"
 	// SDKAccessTokenInvalid 错误码：40014
 	SDKAccessTokenInvalid Error = "AccessToken 无效"
+	// SDKValidateSignatureFailed 错误码：40015
+	SDKValidateSignatureFailed Error = "校验签名错误"
+	// SDKDecryptMSGFailed 错误码：40016
+	SDKDecryptMSGFailed Error = "消息解密失败"
 	// SDKAccessTokenMissing 错误码：41001
 	SDKAccessTokenMissing Error = "缺少AccessToken参数"
 	// SDKAccessTokenExpired 错误码：42001
@@ -53,6 +57,10 @@ func NewSDKErr(code int64, msgList ...string) Error {
 		return SDKInvalidCorpID
 	case 40014:
 		return SDKAccessTokenInvalid
+	case 40015:
+		return SDKValidateSignatureFailed
+	case 40016:
+		return SDKDecryptMSGFailed
 	case 45009:
 		return SDKApiFreqOutOfLimit
 	case 95011: