Add a script to convert a logical tensor to a physical tensor

[tnakaike]

This PR adds a script to convert a logical tensor to a physical tensor on Spyre.

As for now, this script depends on a fork of torch-spyre which can be installed same as an original torch-spyre.

The following is a basic usage.

$ python3 ./scripts/convert_to_spyre_layout.py --shape 32 128
logical      shape=(32, 128)  dtype=torch.float16
device_size  [2, 32, 64]
stride_map   [64, 128, 1]
device_dtype DataFormats.SEN169_FP16
physical     shape=(2, 32, 64)  dtype=torch.float16
round-trip   OK (exact) (recovered shape=(32, 128))