Issues loading pretrained model

[kvantricht]

When I'm trying to install Presto as a package not in editable mode (e.g. to pack it to run on our cluster), I'm experiencing a couple of issues:

• the current pretrained model loading method does not work as the model weights are not considered as package data (probably separate issue).
• An alternative would be to accept a non-default model weights location in the load_pretrained method here but at the moment this is not possible
• As a last resort, I was trying to copy the data folder manually and using update_data_dir from here, but while the data_dir variable is successfully updated, default_model_path from here is not, so it has actually no effect for loading the pretrained model

[gabrieltseng]

In addition to the fix in #22, I think it might make sense to move the weights into the presto folder - what do you think?

[kvantricht]

Yes I think that makes sense, although it needs to be tested if that would resolve the issue. Pathlike reference to package files doesn't always work on all systems.

[gabrieltseng]

Okay - I'll make this change (with some tests) in addition to the notes you left in #20 to a new PR