[Improvement] compute_style_embedding.py

[lucashueda]

13/12/2022 - Next steps to improve compute_style_embedding.py script:

• Code whether only val/test df path are available (in this case, using the umap present in experiment path)
• Stop creating new experiment folders when init trainer
• Code a "get_embedding()" method in model script, to generalize how to get style embeddings
• Code option to export or not the plot figs (like, only export df's to manual plot)
• Code exceptions handlers and asserts to make it better for use