Update on "Support named_data in flat_tensor"

Currently flat_tensor ndm only accounts for tensors in get_data, get_num_keys, get_key functions.
Add support to return named_data values as well.

TODO:consolidate tensors and named_data into one structure in the flatbuffer. This will simplify all the serialization and runtime code.

Differential Revision: [D73679683](https://our.internmc.facebook.com/intern/diff/D73679683/)

[ghstack-poisoned]

Author: lucylq

extension/flat_tensor/flat_tensor_data_map.cpp

@@ -253,7 +253,8 @@ ET_NODISCARD Result<const char*> FlatTensorDataMap::get_key(
       index,
       num_keys);
 
-  if (flat_tensor_->named_data() != nullptr && index < flat_tensor_->named_data()->size()) {
+  if (flat_tensor_->named_data() != nullptr &&
+      index < flat_tensor_->named_data()->size()) {
     return flat_tensor_->named_data()->Get(index)->key()->c_str();
   } else {
     if (flat_tensor_->named_data() != nullptr) {