refactor the runtime code

重构了运行时代码，支持全新的文件系统。

Assets/YooAsset/Runtime/FileSystem/DefaultEditorFileSystem/Operation/DEFSLoadBundleOperation.cs

@@ -0,0 +1,31 @@
+
+namespace YooAsset
+{
+    internal class DEFSLoadBundleOperation : FSLoadBundleOperation
+    {
+        private readonly DefaultEditorFileSystem _fileSystem;
+        private readonly PackageBundle _bundle;
+
+        internal DEFSLoadBundleOperation(DefaultEditorFileSystem fileSystem, PackageBundle bundle)
+        {
+            _fileSystem = fileSystem;
+            _bundle = bundle;
+        }
+        internal override void InternalOnStart()
+        {
+            DownloadProgress = 1f;
+            DownloadedBytes = _bundle.FileSize;
+            Status = EOperationStatus.Succeed;
+        }
+        internal override void InternalOnUpdate()
+        {
+        }
+
+        public override void WaitForAsyncComplete()
+        {
+        }
+        public override void AbortDownloadOperation()
+        {
+        }
+    }
+}