[lazy] support from_pretrained (#4801)

* [lazy] patch from pretrained

* [lazy] fix from pretrained and add tests

* [devops] update ci

colossalai/interface/pretrained.py

@@ -0,0 +1,16 @@
+from typing import Optional
+
+from torch.nn import Module
+
+__all__ = [
+    "get_pretrained_path",
+    "set_pretrained_path",
+]
+
+
+def get_pretrained_path(model: Module) -> Optional[str]:
+    return getattr(model, "_pretrained", None)
+
+
+def set_pretrained_path(model: Module, path: str) -> None:
+    setattr(model, "_pretrained", path)