Refactor signup page to use BLoC pattern and implement authentication repository

- Updated signup.dart to replace Provider with BLoC for state management.
- Created AuthRepository to handle authentication logic and Firestore user management.
- Added TripRepository and UserRepository for trip and user data management.
- Implemented methods for user sign-in, sign-up, and data retrieval in repositories.
- Enhanced trip management with create, update, delete, and participant management functionalities.
- Updated AuthService to include new methods for sign-in and sign-up.
- Removed unnecessary print statements from TripService for cleaner code.
- Added dependencies for flutter_bloc and equatable in pubspec.yaml.

Not tested yet

lib/blocs/auth/auth_bloc.dart

@@ -0,0 +1,150 @@
+import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../repositories/auth_repository.dart';
+import 'auth_event.dart';
+import 'auth_state.dart';
+
+class AuthBloc extends Bloc<AuthEvent, AuthState> {
+  final AuthRepository _authRepository;
+
+  AuthBloc({required AuthRepository authRepository})
+      : _authRepository = authRepository,
+        super(AuthInitial()) {
+    on<AuthCheckRequested>(_onAuthCheckRequested);
+    on<AuthSignInRequested>(_onSignInRequested);
+    on<AuthSignUpRequested>(_onSignUpRequested);
+    on<AuthGoogleSignInRequested>(_onGoogleSignInRequested);
+    on<AuthAppleSignInRequested>(_onAppleSignInRequested);
+    on<AuthSignOutRequested>(_onSignOutRequested);
+    on<AuthPasswordResetRequested>(_onPasswordResetRequested);
+  }
+
+  Future<void> _onAuthCheckRequested(
+    AuthCheckRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    emit(AuthLoading());
+    
+    try {
+      final currentUser = _authRepository.currentUser;
+      
+      if (currentUser != null) {
+        // Récupérer les données utilisateur depuis Firestore
+        final user = await _authRepository.getUserFromFirestore(currentUser.uid);
+        
+        if (user != null) {
+          emit(AuthAuthenticated(user: user));
+        } else {
+          emit(AuthUnauthenticated());
+        }
+      } else {
+        emit(AuthUnauthenticated());
+      }
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+
+  Future<void> _onSignInRequested(
+    AuthSignInRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    emit(AuthLoading());
+    
+    try {
+      final user = await _authRepository.signInWithEmailAndPassword(
+        email: event.email,
+        password: event.password,
+      );
+
+      if (user != null) {
+        emit(AuthAuthenticated(user: user));
+      } else {
+        emit(const AuthError(message: 'Email ou mot de passe incorrect'));
+      }
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+
+  Future<void> _onSignUpRequested(
+    AuthSignUpRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    emit(AuthLoading());
+    
+    try {
+      final user = await _authRepository.signUpWithEmailAndPassword(
+        email: event.email,
+        password: event.password,
+        nom: event.nom,
+        prenom: event.prenom,
+      );
+
+      if (user != null) {
+        emit(AuthAuthenticated(user: user));
+      } else {
+        emit(const AuthError(message: 'Erreur lors de l\'inscription'));
+      }
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+
+  Future<void> _onGoogleSignInRequested(
+    AuthGoogleSignInRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    emit(AuthLoading());
+    
+    try {
+      final user = await _authRepository.signInWithGoogle();
+
+      if (user != null) {
+        emit(AuthAuthenticated(user: user));
+      } else {
+        emit(const AuthError(message: 'Connexion Google annulée'));
+      }
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+
+  Future<void> _onAppleSignInRequested(
+    AuthAppleSignInRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    emit(AuthLoading());
+    
+    try {
+      final user = await _authRepository.signInWithApple();
+
+      if (user != null) {
+        emit(AuthAuthenticated(user: user));
+      } else {
+        emit(const AuthError(message: 'Connexion Apple annulée'));
+      }
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+
+  Future<void> _onSignOutRequested(
+    AuthSignOutRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    await _authRepository.signOut();
+    emit(AuthUnauthenticated());
+  }
+
+  Future<void> _onPasswordResetRequested(
+    AuthPasswordResetRequested event,
+    Emitter<AuthState> emit,
+  ) async {
+    try {
+      await _authRepository.resetPassword(event.email);
+      emit(AuthPasswordResetSent(email: event.email));
+    } catch (e) {
+      emit(AuthError(message: e.toString()));
+    }
+  }
+}