Create cuda-32.json

add gs=32 cuda quantization for use w/ stories15M

Author: mikekgfb

torchchat/quant_config/cuda-32.json

@@ -0,0 +1,5 @@
+{
+    "executor": {"accelerator": "cuda"},
+    "precision": {"dtype": "bf16"},
+    "linear:int4": {"groupsize" : 32}
+}