improvement: add typehints and docs to timm/models/mobilenetv3.py

Author: a-r-r-o-w

timm/models/_typing.py

@@ -0,0 +1,10 @@
+import functools
+import types
+from typing import Any, Dict, List, Tuple, Union
+
+import torch.nn
+
+
+BlockArgs = List[List[Dict[str, Any]]]
+LayerType = Union[type, str, types.FunctionType, functools.partial, torch.nn.Module]
+PadType = Union[str, int, Tuple[int, int]]