Add newaxis to torch aliases

Closes data-apisgh-64

Author: rgommers

array_api_compat/torch/_aliases.py

@@ -144,6 +144,7 @@ def can_cast(from_: Union[Dtype, array], to: Dtype, /) -> bool:
 
 # Basic renames
 bitwise_invert = torch.bitwise_not
+newaxis = None
 
 # Two-arg elementwise functions
 # These require a wrapper to do the correct type promotion on 0-D tensors
@@ -690,8 +691,8 @@ def take(x: array, indices: array, /, *, axis: Optional[int] = None, **kwargs) -
         axis = 0
     return torch.index_select(x, axis, indices, **kwargs)
 
-__all__ = ['result_type', 'can_cast', 'permute_dims', 'bitwise_invert', 'add',
-           'atan2', 'bitwise_and', 'bitwise_left_shift', 'bitwise_or',
+__all__ = ['result_type', 'can_cast', 'permute_dims', 'bitwise_invert', 'newaxis',
+           'add', 'atan2', 'bitwise_and', 'bitwise_left_shift', 'bitwise_or',
            'bitwise_right_shift', 'bitwise_xor', 'divide', 'equal',
            'floor_divide', 'greater', 'greater_equal', 'less', 'less_equal',
            'logaddexp', 'multiply', 'not_equal', 'pow', 'remainder',