Adding FileUpload control and updated related components

src/myfasthtml/core/utils.py

@@ -266,6 +266,7 @@ def post(session, b_id: str, values: dict):
   from myfasthtml.core.bindings import BindingsManager
   binding = BindingsManager.get_binding(b_id)
   if binding:
-    return binding.update(values)
+    res = binding.update(values)
+    return res
   
   raise ValueError(f"Binding with ID '{b_id}' not found.")