streams: implement streams to webstreams adapters

Experimental adapters for the webstreams API

Signed-off-by: James M Snell <[email protected]>

Author: jasnell

lib/internal/fs/promises.js

@@ -788,6 +788,8 @@ module.exports = {
     appendFile,
     readFile,
     watch,
+
+    kHandle,
   },
 
   FileHandle,