feat: add clip transformation

[josephine-funken]

Description

Implements a clip transformation to clip signals to a lower and upper bound for outlier removal.

Fixes issue #695

Implemented changes

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

• implements clip() in pymovements.gaze.transforms
• adds test in gaze_transform_test.test_gaze_transform_expected_frame()

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

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

Project coverage is 100.00%. Comparing base (0eca770) to head (e9fd630).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #700 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 57 57 Lines 2696 2703 +7 Branches 695 697 +2 ========================================= + Hits 2696 2703 +7 ```

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