push fetch devices and connecting the filters

lib/pages/device_managment/bloc/device_managment_event.dart

@@ -1,8 +1,43 @@
 part of 'device_managment_bloc.dart';
 
-sealed class DeviceManagmentEvent extends Equatable {
-  const DeviceManagmentEvent();
+abstract class DeviceManagementEvent extends Equatable {
+  const DeviceManagementEvent();
 
   @override
-  List<Object> get props => [];
+  List<Object?> get props => [];
+}
+
+class FetchDevices extends DeviceManagementEvent {}
+
+class FilterDevices extends DeviceManagementEvent {
+  final String filter;
+
+  const FilterDevices(this.filter);
+
+  @override
+  List<Object?> get props => [filter];
+}
+
+class SelectedFilterChanged extends DeviceManagementEvent {
+  final int selectedIndex;
+
+  const SelectedFilterChanged(this.selectedIndex);
+
+  @override
+  List<Object?> get props => [selectedIndex];
+}
+
+class SearchDevices extends DeviceManagementEvent {
+  final String? community;
+  final String? unitName;
+  final String? productName;
+
+  const SearchDevices({
+    this.community,
+    this.unitName,
+    this.productName,
+  });
+
+  @override
+  List<Object?> get props => [community, unitName, productName];
 }