Add GazeDataFrame.compute_event_properties()

[dkrako]

Description of the problem

Computing event properties is currently only implemented as a Dataset method

If we are working just with a single GazeDataFrame and not with Dataset then we would need an equivalent GazeDataFrame.compute_event_properties().

Description of a solution

Reuse the code from compute_event_properties.

Then refactor the original code in Dataset to call the new GazeDataFrame.compute_event_properties().

Minimum acceptance criteria

• implement GazeDataFrame.compute_event_properties()
• reuse GazeDataFrame.compute_event_properties() in Dataset.compute_event_properties()

Sample Code

gaze = pm.gaze.from_csv('file.csv')
gaze.pix2deg()
gaze.pos2vel()
gaze.detect_events('ivt')
gaze.compute_event_properties(['amplitude', 'dispersion'])