Fix validator imports

[aaravnavani]

This PR fixes this issue and fixes all the notebooks so that the validators are imported from Guardrails Hub instead of the guardrails library.

Note: In the value_within_distribution.ipynb notebook, the SimilarToList validator is imported but I cannot find this validator on Guardrails Hub.

[codecov-commenter]

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[zsimjee]

Thanks for this one too! SimilarToList was renamed to this one https://hub.guardrailsai.com/validator/guardrails/similar_to_previous_values

[zsimjee]

In each notebook, it also makes sense to add a cell to the top of the notebook that installs the relevant validators

ex:

!guardrails hub install hub://guardrails/regex_match

This would make the notebooks self-contained and run on their own. The callout here is that this doesn't work in notebooks yet in 0.4.2, but it was fixed on main in PR https://github.com/guardrails-ai/guardrails/pull/676/files (take a look at guardrails/cli/hub/install.py) so you'll have to install from Github for now to test this out

pip install git+https://github.com/guardrails-ai/guardrails.git@main