refactor(ext/fs): boxed deno_fs::FileSystem (#18945)

1. Boxed `File` and `FileSystem` to allow more easily passing this
through the CLI code (as shown within this pr).
2. `StdFileResource` is now `FileResource`. `FileResource` now contains
an `Rc<dyn File>`.

1 files changed, 7 insertions, 0 deletions

diff --git a/core/resources.rs b/core/resources.rs
index 84e6847fc..94d2a2306 100644
--- a/core/resources.rs
+++ b/core/resources.rs
@@ -187,6 +187,13 @@ pub trait Resource: Any + 'static {
     None
   }
 
+  /// Resources backed by a file descriptor can let ops know to allow for
+  /// low-level optimizations.
+  #[cfg(windows)]
+  fn backing_fd(self: Rc<Self>) -> Option<std::os::windows::io::RawHandle> {
+    None
+  }
+
   fn size_hint(&self) -> (u64, Option<u64>) {
     (0, None)
   }