feat: Add public dataset GazeOnFaces

[prassepaul]

Description

added GazeOnFaces dataset

Fixes issue #

Implemented changes

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

• [x] Added a new dataset: GazeOnFaces

Type of change

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

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (93ab678) 100.00% compared to head (f3c5067) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #567 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 49 50 +1 Lines 2176 2200 +24 Branches 536 543 +7 ========================================= + Hits 2176 2200 +24 ``` | [Files Changed](https://app.codecov.io/gh/aeye-lab/pymovements/pull/567?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aeye-lab) | Coverage Δ | | |---|---|---| | [src/pymovements/datasets/\_\_init\_\_.py](https://app.codecov.io/gh/aeye-lab/pymovements/pull/567?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aeye-lab#diff-c3JjL3B5bW92ZW1lbnRzL2RhdGFzZXRzL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [src/pymovements/datasets/gaze\_on\_faces.py](https://app.codecov.io/gh/aeye-lab/pymovements/pull/567?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aeye-lab#diff-c3JjL3B5bW92ZW1lbnRzL2RhdGFzZXRzL2dhemVfb25fZmFjZXMucHk=) | `100.00% <100.00%> (ø)` | |

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