finish implementing tabpfn

[duncanmcelfresh]

@duncanmcelfresh was working on this, but never finished

[duncanmcelfresh]

@duncanmcelfresh needs to debug & run this

[duncanmcelfresh]

throw an error when the dataset has < 2000 points.

[duncanmcelfresh]

tabpfn is not in our current torch environment on the tabzilla machine image. this is probably because installing tabpfn breaks other parts of our code. @suj97 how did you get this to work before?

[duncanmcelfresh]

finished