Support unannotated elementary bindings

Author: elprans

azure/functions_worker/functions.py

@@ -224,6 +224,11 @@ def add_function(self, function_id: str,
                             f'type of {param.name} binding in function.json '
                             f'"{desc.type}" does not match its Python '
                             f'annotation "{param_py_type.__name__}"')
+            else:
+                if desc.data_type is protos.BindingInfo.string:
+                    param_py_type = str
+                elif desc.data_type is protos.BindingInfo.binary:
+                    param_py_type = bytes
 
             param_type_info = ParamTypeInfo(param_bind_type, param_py_type)
             if is_binding_out:

tests/queue_functions/queue_trigger_untyped/main.py

@@ -4,5 +4,5 @@
 logger = logging.getLogger(__name__)
 
 
-def main(msg: str) -> str:
+def main(msg) -> str:
     return msg