feat: add typedef.js in lib and update documentation in index.js to r…

[YUUU23]

• created typedef.js file in src/lib
• moved JsPsych type from gearshift into this file
• update eslint to include typedef.js
• update documentation in index.js for buildTimeLine function from general object to JsPsych
  • should we in this same PR, update all these general object to JsPsych type for@param documentations for functions where it's applicable?

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[RobertGemmaJr]

Fantastic! I assume you did a sweep of other files in the project? There may be a few places where jsPsych {Object} is still being used. I'd do a quick check of that and then get this merged!