Global DOI for notebooks

Fixes #379, #471 and #472

Overview

Adds a new DOI argument for notebook start / publish and makes garden_doi in the garden_entrypoint decorator optional.

Discussion

The new --doi argument allows the user to specify a global DOI in their notebook's metadata that will publish all entrypoints in that notebook to the specified garden without needing to provide each entrypoint with the DOI. The user can still use the garden_doi in the garden_entrypoint decorator to override the global notebook doi and publish an entrypoint to a different garden.

This PR also includes some small bug fixes:

Updates notebook templates with new metadata and fixes sklearn/tutorial templates to work with new huggingface model (sklearn-iris).
Updates idempotency check for when entrypoints return more complex data types that can't be checked for equality with == (ndarrays and dataframes).
Makes a copy of the EntrypointMetadata object in the garden_entrypoint decorator to store. If the user is lazy and uses the same EntrypointMetadata object for multiple entrypoints, we end up writing over the same metadata object for each entrypoint.

Testing

Fixed test_metadata unit tests to also check for global notebook DOI. Added new idempotency unit tests to check ndarrays.

📚 Documentation preview 📚: https://garden-ai--468.org.readthedocs.build/en/468/

Codecov Report

Attention: Patch coverage is 59.70149% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 76.52%. Comparing base (3268bb4) to head (60a27fe).

Files	Patch %	Lines
garden_ai/app/notebook.py	0.00%	14 Missing :warning:
garden_ai/entrypoints.py	70.00%	6 Missing :warning:
garden_ai/scripts/save_session_and_metadata.py	0.00%	5 Missing :warning:
garden_ai/notebook_metadata.py	50.00%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #468 +/- ## ========================================== - Coverage 76.67% 76.52% -0.16% ========================================== Files 51 51 Lines 3336 3382 +46 ========================================== + Hits 2558 2588 +30 - Misses 778 794 +16 ```

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Garden-AI / garden