[FEA] Support N-D unit tests

[cliffburdick]

The utility functions to convert numpy arrays to tensors only support up to 4D tensors. We should support any arbitrary tensor rank converting to and from numpy.

@nvjonwong recently added a 5D matmul test, but it had to hack around the outer loop because of this limitation:
https://github.com/NVIDIA/MatX/pull/911/files#diff-7a744baf9323d989cd65822b8adbad0385a4e384e31ec85f9a1afaf310b66615

Once the conversion is done this test should be updated.