[Misc] Disambiguate quantized types via a new ScalarType (#6396)

csrc/core/torch_bindings.cpp

@@ -0,0 +1,16 @@
+#include <torch/library.h>
+
+#include "scalar_type.hpp"
+#include "registration.h"
+
+// Note the CORE exstension will be built for (almost) all hardware targets so
+// new additions must account for this. (currently not built for TPU and Neuron)
+
+TORCH_LIBRARY_EXPAND(TORCH_EXTENSION_NAME, lib) {
+  // ScalarType, a custom class for representing data types that supports
+  // quantized types, declared here so it can be used when creating interfaces
+  // for custom ops.
+  vllm::ScalarTypeTorch::bind_class(lib);
+}
+
+REGISTER_EXTENSION(TORCH_EXTENSION_NAME)