Add template specialization for `xtype_for_shape`
Add template specialization for `xtype_for_shape`

Fix https://github.com/QuantStack/xtensor/issues/1310.
QuantStack/xtensor,QuantStack/xtensor,JohanMabille/xtensor,xtensor-stack/xtensor,xtensor-stack/xtensor,JohanMabille/xtensor