feat: add query and infinite query disk caching support

packages/fl_query/lib/fl_query.dart

@@ -1,5 +1,12 @@
 library fl_query;
 
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:hive_flutter/hive_flutter.dart';
+import 'package:path/path.dart'
+    if (dart.library.html) 'package:hive_flutter/src/stub/path.dart'
+    as path_helper;
+
 export 'src/infinite_query.dart';
 export 'src/infinite_query_builder.dart';
 export 'src/query.dart';
@@ -10,4 +17,42 @@ export 'src/mutation_builder.dart';
 export 'src/models/infinite_query_job.dart';
 export 'src/models/query_job.dart';
 export 'src/models/mutation_job.dart';
+import 'package:path_provider/path_provider.dart';
 export 'src/utils.dart' show isShallowEqual, getVariable;
+
+late final kFlQueryBoxKey;
+
+/// `cacheKey`: An unique key to identify the cache of fl_query for this
+///  application
+///
+/// `cacheSubDirectory`: The sub directory to store the cache file
+///
+/// `encryptionKey`: The encryption key to encrypt the cache of fl_query
+///
+/// If not provided then the cache won't be encrypted.
+/// The encryption key must be a list of 32 integers
+///
+/// You can use [Random.secure().nextBytes(32)] to generate a random encryption key.
+/// And store that key in a secure storage like
+/// [flutter_secure_storage](https://pub.dev/packages/flutter_secure_storage)
+///  for securely storing the encryption key when your application is closed.
+Future<void> initializeFlQuery({
+  required String cacheKey,
+  List<int>? encryptionKey,
+  String? cacheSubDirectory,
+}) async {
+  WidgetsFlutterBinding.ensureInitialized();
+  if (kIsWeb) return;
+
+  final appDir = await getApplicationDocumentsDirectory();
+  Hive.init(
+    path_helper.join(appDir.path, cacheSubDirectory),
+    backendPreference: HiveStorageBackendPreference.webWorker,
+  );
+  kFlQueryBoxKey = cacheKey + "-fl_query";
+  await Hive.openLazyBox<String>(
+    kFlQueryBoxKey,
+    encryptionCipher:
+        encryptionKey != null ? HiveAesCipher(encryptionKey) : null,
+  );
+}