Document the `utils` module and reference it in the randomization docs

[bjoluc]

Adds a Reference > jsPsych.utils documentation page. To do: Reference deepCopy in the randomization docs to resolve #2808. I'm not quite sure where. @ChristopheBossens @jspsych/core Any suggestions?

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[ChristopheBossens]

Adds a Reference > jsPsych.utils documentation page. To do: Reference deepCopy in the randomization docs to resolve #2808. I'm not quite sure where. @ChristopheBossens @jspsych/core Any suggestions?

I have not checked but I think the issue with #2808 could also arise using e.g., the randomization.repeat function? I first thought a general reference at the top of the docs should work. But I think a lot of people might just read the parameters list of the respective function they want to use and miss that. Maybe add a small disclaimer to array parameter description for the relevant functions (e.g., "if your array contains arrays, consider if a deepCopy is necessary")?