Added training scripts for HSTU using keras and jax trainers #140
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Summary
Added training scripts for HSTU using both Keras and Jax trainers. This is an implementation of how HSTU in this library can be trained on TPU using different trainers. The hyper parameters (e.g vocab_size, etc.) are set based on the Amazon Books dataset. However, those can be changed based on the dataset used and other factors.
Verified training on Trillium chip, which ran successfully when using both trainers.