feat(content): create headline events

- Added data load event
- Added title change event
- Added description change event
- Added submit event

Author: fulleni

lib/content_management/bloc/create_headline/create_headline_event.dart

@@ -0,0 +1,68 @@
+part of 'create_headline_bloc.dart';
+
+/// Base class for all events related to the [CreateHeadlineBloc].
+abstract class CreateHeadlineEvent extends Equatable {
+  const CreateHeadlineEvent();
+
+  @override
+  List<Object?> get props => [];
+}
+
+/// Event to signal that the data for dropdowns should be loaded.
+class CreateHeadlineDataLoaded extends CreateHeadlineEvent {
+  const CreateHeadlineDataLoaded();
+}
+
+/// Event for when the headline's title is changed.
+class CreateHeadlineTitleChanged extends CreateHeadlineEvent {
+  const CreateHeadlineTitleChanged(this.title);
+  final String title;
+  @override
+  List<Object> get props => [title];
+}
+
+/// Event for when the headline's description is changed.
+class CreateHeadlineDescriptionChanged extends CreateHeadlineEvent {
+  const CreateHeadlineDescriptionChanged(this.description);
+  final String description;
+  @override
+  List<Object> get props => [description];
+}
+
+/// Event for when the headline's URL is changed.
+class CreateHeadlineUrlChanged extends CreateHeadlineEvent {
+  const CreateHeadlineUrlChanged(this.url);
+  final String url;
+  @override
+  List<Object> get props => [url];
+}
+
+/// Event for when the headline's image URL is changed.
+class CreateHeadlineImageUrlChanged extends CreateHeadlineEvent {
+  const CreateHeadlineImageUrlChanged(this.imageUrl);
+  final String imageUrl;
+  @override
+  List<Object> get props => [imageUrl];
+}
+
+/// Event for when the headline's source is changed.
+class CreateHeadlineSourceChanged extends CreateHeadlineEvent {
+  const CreateHeadlineSourceChanged(this.source);
+  final Source? source;
+  @override
+  List<Object?> get props => [source];
+}
+
+/// Event for when the headline's category is changed.
+class CreateHeadlineCategoryChanged extends CreateHeadlineEvent {
+  const CreateHeadlineCategoryChanged(this.category);
+  final Category? category;
+  @override
+  List<Object?> get props => [category];
+}
+
+/// Event to signal that the form should be submitted.
+class CreateHeadlineSubmitted extends CreateHeadlineEvent {
+  const CreateHeadlineSubmitted();
+}
+