feat(create_source): add events for managing source creation

Author: fulleni

lib/content_management/bloc/create_source/create_source_event.dart

@@ -0,0 +1,67 @@
+part of 'create_source_bloc.dart';
+
+/// Base class for all events related to the [CreateSourceBloc].
+sealed class CreateSourceEvent extends Equatable {
+  const CreateSourceEvent();
+
+  @override
+  List<Object?> get props => [];
+}
+
+/// Event to signal that the data for dropdowns should be loaded.
+final class CreateSourceDataLoaded extends CreateSourceEvent {
+  const CreateSourceDataLoaded();
+}
+
+/// Event for when the source's name is changed.
+final class CreateSourceNameChanged extends CreateSourceEvent {
+  const CreateSourceNameChanged(this.name);
+  final String name;
+  @override
+  List<Object> get props => [name];
+}
+
+/// Event for when the source's description is changed.
+final class CreateSourceDescriptionChanged extends CreateSourceEvent {
+  const CreateSourceDescriptionChanged(this.description);
+  final String description;
+  @override
+  List<Object> get props => [description];
+}
+
+/// Event for when the source's URL is changed.
+final class CreateSourceUrlChanged extends CreateSourceEvent {
+  const CreateSourceUrlChanged(this.url);
+  final String url;
+  @override
+  List<Object> get props => [url];
+}
+
+/// Event for when the source's type is changed.
+final class CreateSourceTypeChanged extends CreateSourceEvent {
+  const CreateSourceTypeChanged(this.sourceType);
+  final SourceType? sourceType;
+  @override
+  List<Object?> get props => [sourceType];
+}
+
+/// Event for when the source's language is changed.
+final class CreateSourceLanguageChanged extends CreateSourceEvent {
+  const CreateSourceLanguageChanged(this.language);
+  final String language;
+  @override
+  List<Object> get props => [language];
+}
+
+/// Event for when the source's headquarters is changed.
+final class CreateSourceHeadquartersChanged extends CreateSourceEvent {
+  const CreateSourceHeadquartersChanged(this.headquarters);
+  final Country? headquarters;
+  @override
+  List<Object?> get props => [headquarters];
+}
+
+/// Event to signal that the form should be submitted.
+final class CreateSourceSubmitted extends CreateSourceEvent {
+  const CreateSourceSubmitted();
+}