Adding TArrow for testing

[edyoshikun]

This PR adds the Tarrow package wrapped with lightning. It also contains a DataLoader to get the pair of timepoints from ome-zarr.

[mattersoflight]

@edyoshikun I was able to draw a batch and construct the model! I now realize the model encodes temporal changes into a dense representation at each time point. The output tensor has 16 channels for each pixel in the input. In other words, the model "lifts" the image into a higher dimension instead of "compressing" it into an embedding.

For any meaningful comparison with dynaCLR, we will need a downstream embedding model: