dataset: Add Gaze4hate dataset

[saeub]

Resolves #949

TODO

• Add gaze data as soon as it's uploaded
• Fill in metadata TODOs
• Check docstring description
• Run tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2d9da18) to head (4fe55c1).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1007   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           79        80    +1     
  Lines         3586      3611   +25     
  Branches       632       632           
=========================================
+ Hits          3586      3611   +25     

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