Update classifier container to allow pipeline to go straight to inference

[rwood-97]

Summary

This PR fixes #275 in two ways:

• Adds method to create a dataloader from a PatchDataset.
• Adds the ability to create a ClassifierContainer without defining a dataloader. Datasets can then be added using the load_dataset() method.

Fixes #275

Describe your changes

• Add create_dataloaders() method to PatchDataset
• Require model and labels_map or load_path
• Only require criterion for training/validation

Checklist before assigning a reviewer (update as needed)

• Self-review code
• Ensure submission passes current tests
• Add tests
• Update docs

Reviewer checklist

Please add anything you want reviewers to specifically focus/comment on.

• Everything looks ok?

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