Update deps and doc + refacto models + adds GNNs

[colon3ltocard]

• Update Python dependencies
• Fix metric test on GPU
• Fix/improve README.md (NamedTensor and UNETR++)
• Update torch version in Dockerfile
• Makes sure unit test write model checkpoints in a temporary directory
• Adds GNNs from py4cast
• Adds a ModelType Enum + model_type attribute to classify models in arch families (graph, conv, vision_transformers, llm , ...)
• Adds mandatory settings to model instance to make sure we always have access to all params used to setup a model
• Adds mandatory num_spatial_dims attribute to model instance to be able to know at runtime if 1d, 2d or 3d instance
• Adds boolean features_last mandatory attribute to models to allow callers to einops rearrange at runtime on a per model basis

[flyIchtus]

Very minor suggestion for the sake of error handling