Refactor dataset validators

[lochhh]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Closes #241 #210

What does this PR do?

• Reorganises the datasets validators to subclass from a _BaseValidDataset
• Rewrites the relevant tests to reduce duplication - what have been tested in the parent class are not repeated in the subclasses
• Enforces uniqueness in keypoint_names, individual_names supplied (in addition to length check)
• Replaces hardcoded index numbers (e.g. fragile assumption that -1 refers to the individuals dim) by inferring based on DIM_NAMES

References

#241, #210 part of #667

How has this PR been tested?

Unit tests have been rewritten

Is this a breaking change?

No, one should still be able to use the Validators (i.e. ValidPosesDataset, ValidBboxesDataset) as before.

Does this PR require an update to the documentation?

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 100.00%. Comparing base (5413011) to head (6e9107d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #706   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines         2022      2083   +61     
=========================================
+ Hits          2022      2083   +61     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud