fix: make Freezed templates compatible with Freezed 3

bricks/bloc/__brick__/{{~ freezed_event }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}Event with _${{name.pascalCase()}}Event {
+abstract class {{name.pascalCase()}}Event with _${{name.pascalCase()}}Event {
   const factory {{name.pascalCase()}}Event.started() = _Started;
 }

bricks/bloc/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

bricks/cubit/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_cubit.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

bricks/hydrated_bloc/__brick__/{{~ freezed_event }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}Event with _${{name.pascalCase()}}Event {
+abstract class {{name.pascalCase()}}Event with _${{name.pascalCase()}}Event {
   const factory {{name.pascalCase()}}Event.started() = _Started;
 }

bricks/hydrated_bloc/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

bricks/hydrated_cubit/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_cubit.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

bricks/replay_bloc/__brick__/{{~ freezed_event }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}Event extends ReplayEvent with _${{name.pascalCase()}}Event {
+abstract class {{name.pascalCase()}}Event extends ReplayEvent with _${{name.pascalCase()}}Event {
   const factory {{name.pascalCase()}}Event.started() = _Started;
 }

bricks/replay_bloc/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_bloc.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

bricks/replay_cubit/__brick__/{{~ freezed_state }}

@@ -1,6 +1,6 @@
 part of '{{name.snakeCase()}}_cubit.dart';
 
 @freezed
-class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
+abstract class {{name.pascalCase()}}State with _${{name.pascalCase()}}State {
   const factory {{name.pascalCase()}}State.initial() = _Initial;
 }

extensions/intellij/intellij_generator_plugin/src/main/resources/templates/bloc_freezed/bloc_event.dart.template

@@ -1,6 +1,6 @@
 part of '{{bloc_snake_case}}_bloc.dart';
 
 @freezed
-class {{bloc_pascal_case}}Event with _${{bloc_pascal_case}}Event {
+abstract class {{bloc_pascal_case}}Event with _${{bloc_pascal_case}}Event {
   const factory {{bloc_pascal_case}}Event.started() = _Started;
 }

extensions/intellij/intellij_generator_plugin/src/main/resources/templates/bloc_freezed/bloc_state.dart.template

@@ -1,6 +1,6 @@
 part of '{{bloc_snake_case}}_bloc.dart';
 
 @freezed
-class {{bloc_pascal_case}}State with _${{bloc_pascal_case}}State {
+abstract class {{bloc_pascal_case}}State with _${{bloc_pascal_case}}State {
   const factory {{bloc_pascal_case}}State.initial() = _Initial;
 }

extensions/intellij/intellij_generator_plugin/src/main/resources/templates/cubit_freezed/cubit_state.dart.template

@@ -1,6 +1,6 @@
 part of '{{cubit_snake_case}}_cubit.dart';
 
 @freezed
-class {{cubit_pascal_case}}State with _${{cubit_pascal_case}}State {
+abstract class {{cubit_pascal_case}}State with _${{cubit_pascal_case}}State {
   const factory {{cubit_pascal_case}}State.initial() = _Initial;
 }

extensions/vscode/src/templates/bloc-event.template.ts

@@ -54,7 +54,7 @@ function getFreezedBlocEvent(blocName: string): string {
   return `part of '${snakeCaseBlocName}_bloc.dart';
 
 @freezed
-class ${pascalCaseBlocName} with _\$${pascalCaseBlocName} {
+abstract class ${pascalCaseBlocName} with _\$${pascalCaseBlocName} {
   const factory ${pascalCaseBlocName}.started() = _Started;
 }`;
 }

extensions/vscode/src/templates/bloc-state.template.ts

@@ -60,7 +60,7 @@ function getFreezedBlocStateTemplate(blocName: string): string {
   return `part of '${snakeCaseBlocName}_bloc.dart';
 
 @freezed
-class ${pascalCaseBlocName} with _\$${pascalCaseBlocName} {
+abstract class ${pascalCaseBlocName} with _\$${pascalCaseBlocName} {
   const factory ${pascalCaseBlocName}.initial() = _Initial;
 }
 `;

extensions/vscode/src/templates/cubit-state.template.ts

@@ -60,7 +60,7 @@ function getFreezedCubitStateTemplate(cubitName: string): string {
   return `part of '${snakeCaseCubitName}_cubit.dart';
 
 @freezed
-class ${pascalCaseCubitName}State with _\$${pascalCaseCubitName}State {
+abstract class ${pascalCaseCubitName}State with _\$${pascalCaseCubitName}State {
   const factory ${pascalCaseCubitName}State.initial() = _Initial;
 }
 `;