feat!: add time column if missing during gaze initialization

[dkrako]

Description

During development of #382 I encountered potential bugs if there is no time column present. For a robust implementation we need to guarantee that a time column exists.

Depends on #650 for pydocstyle ignores

Implemented changes

During initialization, there's an if clause that checks for a passed time column. If there is none, one will be created with pl.arange(0, len(self.frame))

How Has This Been Tested?

• [x] Updated tests to always have a time column, even in case of zero rows and no data

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:

Comparison is base (a526dd0) 100.00% compared to head (98dc8af) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #654 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 54 54 Lines 2362 2366 +4 Branches 589 590 +1 ========================================= + Hits 2362 2366 +4 ```

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[SiQube]

merge conflict

[dkrako]

I improved on the timesteps creation by taking account of the experiment sampling rate to create timesteps in millisecond unit.

[SiQube]

merge conflict