Add relative action processor steps (#6)

- Add relative action processor steps (9f19a5c9b269a948c8600477048ecdb1e8f25a09)
- Update processor pipeline JSON (ea8a837d7487b8c5f059e286ed8aba0347379691)


Co-authored-by: HaomingSong <HaomingSong@users.noreply.huggingface.co>

policy_postprocessor.json

@@ -13,6 +13,12 @@
         }
       }
     },
+    {
+      "registry_name": "absolute_actions_processor",
+      "config": {
+        "enabled": false
+      }
+    },
     {
       "registry_name": "device_processor",
       "config": {

policy_preprocessor.json

@@ -33,6 +33,16 @@
         "float_dtype": null
       }
     },
+    {
+      "registry_name": "relative_actions_processor",
+      "config": {
+        "enabled": false,
+        "exclude_joints": [
+          "gripper"
+        ],
+        "action_names": null
+      }
+    },
     {
       "registry_name": "normalizer_processor",
       "config": {