feat: Add clear cache command

lib/src/utils/commands_extension.dart

@@ -215,6 +215,10 @@ extension CommandsClientExtension on Client {
           .clearOrUseOutboundGroupSession(args.room.id, wipe: true);
       return '';
     });
+    addCommand('clearcache', (CommandArgs args) async {
+      await clearCache();
+      return '';
+    });
   }
 }
 

test/commands_test.dart

@@ -311,6 +311,11 @@ void main() {
       }
     });
 
+    test('create', () async {
+      await room.sendTextEvent('/clearcache');
+      expect(room.client.prevBatch, null);
+    });
+
     test('dispose client', () async {
       await client.dispose(closeDatabase: true);
     });