Add numpy_t as alias of transpose (#2046)

Author: pcuenca

coremltools/converters/mil/frontend/torch/ops.py

@@ -788,7 +788,7 @@ def gt(context, node):
     context.add(greater)
 
 
-@register_torch_op(torch_alias=["t"])
+@register_torch_op(torch_alias=["t", "numpy_t"])
 def transpose(context, node):
     assert len(node.outputs) == 1
     inputs = _get_inputs(context, node)