Separate AutoGPTQ dep to `pip install -e .[auto-gptq]` (#1077)

* Separate AutoGPTQ dep to `pip install -e .[auto-gptq]`

* Fix code review

requirements.txt

@@ -1,5 +1,4 @@
 --extra-index-url https://huggingface.github.io/autogptq-index/whl/cu118/
-auto-gptq==0.5.1
 packaging
 peft==0.7.0
 transformers @ git+https://github.com/huggingface/transformers.git@3cefac1d974db5e2825a0cb2b842883a628be7a0

setup.py

@@ -61,5 +61,8 @@ setup(
         "mamba-ssm": [
             "mamba-ssm==1.0.1",
         ],
+        "auto-gptq": [
+            "auto-gptq==0.5.1",
+        ],
     },
 )