feat: Add trial_columns argument in from_asc()

[saeub]

Description

Trial columns can be parsed from ASC files using custom patterns, but they cannot be easily set as trial columns. This PR adds trial_columns argument and passes it on to GazeDataFrame.__init__() (analogously to from_csv()).

Implemented changes

Insert a description of the changes implemented in the pull request.

• Add trial_columns argument

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change is or requires a documentation update

How Has This Been Tested?

Let me know if I should write any tests for this change.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2c4a63e) to head (180d7e5).

Additional details and impacted files

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##              main      #898   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           74        74           
  Lines         3419      3419           
  Branches       613       613           
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  Hits          3419      3419           

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