TF-524 Clean up recent search cache

lib/features/cleanup/domain/model/cleanup_rule.dart

@@ -1,13 +1,12 @@
 
 import 'package:equatable/equatable.dart';
 
-class CleanupRule with EquatableMixin {
-  final Duration cachingEmailPeriod;
+abstract class CleanupRule with EquatableMixin {
 
-  CleanupRule(this.cachingEmailPeriod);
+  CleanupRule();
 
   @override
-  List<Object?> get props => [cachingEmailPeriod];
+  List<Object?> get props => [];
 }
 
 class Duration with EquatableMixin {

lib/features/cleanup/domain/model/email_cleanup_rule.dart

@@ -0,0 +1,11 @@
+
+import 'package:tmail_ui_user/features/cleanup/domain/model/cleanup_rule.dart';
+
+class EmailCleanupRule extends CleanupRule {
+  final Duration cachingEmailPeriod;
+
+  EmailCleanupRule(this.cachingEmailPeriod) : super();
+
+  @override
+  List<Object?> get props => [cachingEmailPeriod];
+}

lib/features/cleanup/domain/model/recent_search_cleanup_rule.dart

@@ -0,0 +1,13 @@
+
+import 'package:tmail_ui_user/features/cleanup/domain/model/cleanup_rule.dart';
+
+class RecentSearchCleanupRule extends CleanupRule {
+  final int storageLimit;
+
+  RecentSearchCleanupRule(
+      {this.storageLimit = 10}
+  ) : super();
+
+  @override
+  List<Object?> get props => [storageLimit];
+}