Add new scroll and search events behaviors and config

Sebastien Lefebvrerequested to merge
issue/pianoanalytics-3572302:3572302-add-new-events into 2.x
  • Adds a Scroll event in javascript
    • Adds a flag in config to activate or not the event triggering
    • Adds a numerical field to set at which percentage the scroll event should trigger itself
  • Adds a Search event in javascript, sending searched keyword and presence of results
    • Adds a flag in config to activate or not the event triggering

Closes #3572302

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