Build and Test: Add support for higher rank cinm.op.reduce Allows selecting the dimension to reduce on, and reducing tensors along one dimension, to a tensor of 1 rank lower, instead of only supporting vector->scalar.

Build and Test: Add support for higher rank cinm.op.reduce Allows selecting the dimension to reduce on, and reducing tensors along one dimension, to a tensor of 1 rank lower, instead of only supporting vector->scalar. #35