fix: Infer correct number of components in gaze init

[dkrako]

Description

This PR implements a more robust way of inferring the number of components in a GazeDataFrame.

Fixes issue #514

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Added components checks to existing gaze init tests

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 (2e59d0c) 100.00% compared to head (19007d4) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #521   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         2117      2129   +12     
  Branches       511       516    +5     
=========================================
+ Hits          2117      2129   +12     

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

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[prassepaul]

see the comment above. maybe we can/should change that?