Add Notify MFA module (#16314)

* Add Notify MFA

* Fix unit test

* Address review comment, change storage implementation

* Add retry limit to mfa module

* Fix loading

* Fix invalaid login log processing

* Typing

* Change default message template

* Change one-time password to 8 digit

* Refactoring to not save secret

* Bug fixing

* Change async_initialize method name to aysnc_initialize_login_mfa_step

* Address some simple fix code review comment

homeassistant/components/auth/strings.json

@@ -11,6 +11,25 @@
       "error": {
         "invalid_code": "Invalid code, please try again. If you get this error consistently, please make sure the clock of your Home Assistant system is accurate."
       }
+    },
+    "notify": {
+      "title": "Notify One-Time Password",
+      "step": {
+        "init": {
+          "title": "Set up one-time password delivered by notify component",
+          "description": "Please select one of notify service:"
+        },
+        "setup": {
+          "title": "Verify setup",
+          "description": "A one-time password have sent by **notify.{notify_service}**. Please input it in below:"
+        }
+      },
+      "abort": {
+        "no_available_service": "No available notify services."
+      },
+      "error": {
+        "invalid_code": "Invalid code, please try again."
+      }
     }
   }
 }