[P1] Streamlining trainable intervention artifacts saving and sharing

[frankaging]

Description:
After training, the intervention's artifacts are saved in memory without a good way of saving to disk with other metadata or sharing on huggingface marketplace. This will be a change to provide a smooth way of saving/sharing interventions trained by users.

The key thing will be serializing metadata into a shareable format (i.e., serializing and deserializing need both be tested). It will still require sharing parties to know the counterfactual dataset generation, but it is less of a problem of this library and more about sharing the dataset itself. And dataset sharing could be a separate process not included in this library.

This change should also consider sharing interventions that contain a vector store (some truthful direction for sharing, etc..).

Testing Done:

• Local Test Log:

.Removing testing dir ./test_output_dir_prefix-d9080f
Removing testing dir ./test_output_dir_prefix-dff621
Removing testing dir ./test_output_dir_prefix-9227e2
Removing testing dir ./test_output_dir_prefix-6cb8c4
Removing testing dir ./test_output_dir_prefix-67cd73

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Ran 25 tests in 4.280s

OK

• New Tutorial Added tutorials/basic_tutorials/Load_Save_and_Share_Interventions.ipynb.