add account delection page

lib/data/services/auth_imp.dart

@@ -69,4 +69,9 @@ class AuthServiceImp implements AuthService {
   Future<void> signoutStart() {
     return authFb.signoutStart();
   }
+
+  @override
+  Future<void> deleteAccount() {
+    return authFb.deleteAccount();
+  }
 }

lib/data/services/auth_service.dart

@@ -14,4 +14,5 @@ abstract class AuthService {
   Future<bool> hasInvite();
   Stream<User?> getUserStream();
   Stream<Setting> getSetting();
+  Future<void> deleteAccount();
 }