PHATE dimensionality reduction

[enjalot]

It would be interesting to be able to swap PHATE for UMAP for dimensionality reduction.
https://phate.readthedocs.io/en/stable/

I'm imagining step 2 becomes "Projection" instead of "UMAP" and then there is a toggle to switch between umap and phate.
The Setup UI would then need to show slightly different parameters.

I'm thinking this would be implemented as a new phater.py script similar to umapper.py that does PHATE and outputs phate-001.parquet etc.
Then when you cluster you could pass in either a umap-001 or phate-001. Perhaps renaming the umaps folder to projections and allowing either umap-* or phate-* would be the way to go, as the outputs will be essentially identical, but recording the inputs will be important.
This would also mean having references to umap_id in cluster-.json and scope-.json be updated to projection_id