feat: Add GazeDataFrame.apply()

[dkrako]

Description

This creates a facade method that can be used for both gaze transformations and event detection.

Implemented changes

• Add GazeDataFrame.apply()

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Copied contents from three event detection test cases
• Copied contents from three transformation test cases

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4de6d34) 100.00% compared to head (7372d91) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #558   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           49        49           
  Lines         2164      2176   +12     
  Branches       532       536    +4     
=========================================
+ Hits          2164      2176   +12     

Files Changed	Coverage Δ
src/pymovements/events/detection/_library.py	100.00% <100.00%> (ø)
src/pymovements/gaze/gaze_dataframe.py	100.00% <100.00%> (ø)
src/pymovements/gaze/transforms.py	100.00% <100.00%> (ø)

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