feat: add image block on mobile (#4230)

frontend/appflowy_flutter/lib/startup/startup.dart

@@ -103,6 +103,7 @@ class FlowyRunner {
         // there's a flag named _enable in memory_leak_detector.dart. If it's false, the task will be ignored.
         MemoryLeakDetectorTask(),
         const DebugTask(),
+        const DeviceInfoTask(),
         // localization
         const InitLocalizationTask(),
         // init the app window

frontend/appflowy_flutter/lib/startup/tasks/device_info_task.dart

@@ -0,0 +1,23 @@
+import 'dart:io';
+
+import 'package:device_info_plus/device_info_plus.dart';
+
+import '../startup.dart';
+
+class DeviceInfoTask extends LaunchTask {
+  const DeviceInfoTask();
+
+  static int androidSDKVersion = -1;
+
+  @override
+  Future<void> initialize(LaunchContext context) async {
+    final DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
+    if (Platform.isAndroid) {
+      final androidInfo = await deviceInfoPlugin.androidInfo;
+      androidSDKVersion = androidInfo.version.sdkInt;
+    }
+  }
+
+  @override
+  Future<void> dispose() async {}
+}

frontend/appflowy_flutter/lib/startup/tasks/prelude.dart

@@ -1,6 +1,7 @@
 export 'app_widget.dart';
 export 'appflowy_cloud_task.dart';
 export 'debug_task.dart';
+export 'device_info_task.dart';
 export 'generate_router.dart';
 export 'hot_key.dart';
 export 'load_plugin.dart';