Set up framework for fetching data for testing

[sfmig]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
To support testing on sample data

What does this PR do?

• Sets up the structure of tests and fixtures
• Sets up a pooch registry to fetch test data from the corresponding GIN repo.
• Adds a fixture for the "annotations" module that retrieves the data to test it.

References

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How has this PR been tested?

Tests pass locally and in CI.

Is this a breaking change?

No.

Does this PR require an update to the documentation?

I opened a separate PR to add contributing guidelines following the movement example.

The GIN repo includes a readme explaining how to add or edit test data.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (bd43585) to head (fc1b0f2).
Report is 1 commits behind head on main.

Additional details and impacted files

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[niksirbi]

This looks goood @sfmig!

Very neatly organised. It works as far as I could tell. I used the annotations fixture to write some very simple tests, and it all worked as expected, incl. the re-download of files-registry.txt each time the tests were run.