feat: Add events to GazeDataFrame init

[dkrako]

Description

Add events keyword argument to GazeDataFrame initializer.
For a start I would like to keep this rather simple.

#552 must be merged first

Implemented changes

• If events is None: create empty EventDataFrame
• Else: create copy of passed EventDataFrame

Type of change

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

How Has This Been Tested?

• Tested attributes after initialization for a few dataframe combinations

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 (097cbbb) 100.00% compared to head (01b8c03) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #553   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         2139      2143    +4     
  Branches       521       522    +1     
=========================================
+ Hits          2139      2143    +4     

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

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[SiQube]

as usual great work -- the circular import is kinda ugly. please open an issue before merging it