add basic support for the optimi adamw optimizer (#1727)

* add support for optimi_adamw optimizer w kahan summation

* pydantic validator for optimi_adamw

* workaround for setting optimizer for fsdp

* make sure to install optimizer packages

* make sure to have parity for model parameters passed to optimizer

* add smoke test for optimi_adamw optimizer

* don't use foreach optimi by default

setup.py

@@ -104,5 +104,11 @@ setup(
         "galore": [
             "galore_torch",
         ],
+        "optimizers": [
+            "galore_torch",
+            "lion-pytorch==0.1.2",
+            "lomo-optim==0.1.1",
+            "torch-optimi==0.2.1",
+        ],
     },
 )