chore: add sign in step enums

Author: khatruong2009

packages/amplify_core/lib/src/types/auth/sign_in/auth_sign_in_step.dart

@@ -10,17 +10,27 @@ enum AuthSignInStep {
   /// an MFA method.
   continueSignInWithMfaSelection,
 
+  /// The sign-in is not complete and the user must set up and select an MFA method. 
+  continueSignInWithMfaSetupSelection,
+
   /// The sign-in is not complete and a TOTP authenticator app must be
   /// registered before continuing.
   continueSignInWithTotpSetup,
 
+  /// The sign-in is not complete and an Email MFA must be set up before
+  /// continuing.
+  continueSignInWithEmailMfaSetup,
+
   /// The sign-in is not complete and must be confirmed with an SMS code.
   confirmSignInWithSmsMfaCode,
 
   /// The sign-in is not complete and must be confirmed with a TOTP code
   /// from a registered authenticator app.
   confirmSignInWithTotpMfaCode,
 
+  /// The sign-in is not complete and must be confirmed with an email code.
+  confirmSignInWithEmailMfaCode,
+
   /// The sign-in is not complete and must be confirmed with the user's new
   /// password.
   confirmSignInWithNewPassword,