feat: parse eyelink metadata

[theDebbister]

Description

Partially fixes issue #510

Implemented changes

binocular is not yet supported

• [x] parses datetime, version_number, model, SR, tracked eye, filter and tracking from eyelink asc file
• [x] For the version and the model: if those cannot be parsed correctly, their value will be 'unknown'
• [x] raise Warning if no metadata at all is found

Type of change

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

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (f103778) to head (941ebd8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #674 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 55 55 Lines 2463 2500 +37 Branches 621 633 +12 ========================================= + Hits 2463 2500 +37 ```

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