feat(authentication): add cooldownEndTime to AuthenticationState

- Add cooldownEndTime field to track the end time of cooldown for requesting a new code
- Update copyWith method to include cooldownEndTime parameter and clearCooldownEndTime option
- Modify props list to include cooldownEndTime

Author: fulleni

lib/authentication/bloc/authentication_state.dart

@@ -39,6 +39,7 @@ class AuthenticationState extends Equatable {
     this.user,
     this.email,
     this.exception,
+    this.cooldownEndTime,
   });
 
   /// The current status of the authentication process.
@@ -53,21 +54,28 @@ class AuthenticationState extends Equatable {
   /// The exception that occurred, if any.
   final HttpException? exception;
 
+  /// The time when the cooldown for requesting a new code ends.
+  final DateTime? cooldownEndTime;
+
   /// Creates a copy of the current [AuthenticationState] with updated values.
   AuthenticationState copyWith({
     AuthenticationStatus? status,
     User? user,
     String? email,
     HttpException? exception,
+    DateTime? cooldownEndTime,
+    bool clearCooldownEndTime = false,
   }) {
     return AuthenticationState(
       status: status ?? this.status,
       user: user ?? this.user,
       email: email ?? this.email,
       exception: exception ?? this.exception,
+      cooldownEndTime:
+          clearCooldownEndTime ? null : cooldownEndTime ?? this.cooldownEndTime,
     );
   }
 
   @override
-  List<Object?> get props => [status, user, email, exception];
+  List<Object?> get props => [status, user, email, exception, cooldownEndTime];
 }