Add tutorial module

[jukent]

Change Summary

Creates tutorial.py module to get the URL for catalogues to be used in tutorial examples and easily accessible for new learners.

Updates init.py to access the load_catalogue fx

Related issue number

• Closes Expose Intake-ESM test data for download #437
• Replaces Tuorial module for grabbing data #443 (that branch got too messy)

Checklist

• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable

Documentation will be updated to make use of this new URL access.

[jukent]

I wish I understood Pytest more. This is my attempt at using pytest.mark.parametrize as best as I can gather from the docs. I think I need to be done for today, but any help is appreciated!

NOTE: The URL the data points to will not exist until after the merge. Could that contribute to failing tests? (Not the immediate ones, as those are KeyErrors)

[jukent]

The tests are failing now with a "FileNotFoundError: https://raw.githubusercontent.com/intake/intake-esm/main/tutorial-catalogs/GOOGLE-CMIP6.json" which is a file that WILL exist... after the merge. What is the best approach to this? @andersy005

[andersy005]

Thank you, @jukent! This looks great