Added timeout in case the JNI Isolate crashes and adds a dispose method to be kill the JNI Isolate

lib/jni_isolate.dart

@@ -190,6 +190,10 @@ class JniIsolate {
     }
   }
 
+  dispose() {
+    _jvmIsolate.kill(priority: Isolate.immediate);
+  }
+
   List<JSAnime> _getAnimeSearchResults(JAniyomiBridge jAniyomiBridge, String query, int page, String source) {
     JList<JObject?>? searchResults = jAniyomiBridge.getAnimeSearchResults(
       JString.fromString(query),