Add detections validator

[sfmig]

Description

This PR:

• adds a validator for a bounding box detections dataset
• adds an abstract base class for valid ethology datasets
• factors out the validators module
• extends the dataset validators (for bbox annotations and detections) to check a minimum set of dimensions per data variable
• adds tests

Also:

• fixes to sphinx docs to prevent warnings when parent classes
• renaming of fixtures related to ethology datasets for consistency and clarity

References

Related to PR #114

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?

Included.

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 99.45%. Comparing base (48cdd82) to head (10fc95b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   99.42%   99.45%   +0.02%     
==========================================
  Files           6        8       +2     
  Lines         525      553      +28     
==========================================
+ Hits          522      550      +28     
  Misses          3        3              

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