Issue #3526719 by joachim-desarmenien : Add RGAA compliant opt-out checkbox to handle user consent

joachim desarmenienrequested to merge
issue/pianoanalytics-3526719:3526719-add-rgaa-compliant into 2.x

Adds opt-out functionality to piano analytics module

  • Adds block with an opt-out checbox
  • Stores checkbox value in localstorage
  • Handles opt-in and opt-out consent value according to documentation

Documentation can be found here: https://developers.atinternet-solutions.com/piano-analytics/data-collection/how-to-send-events/consent

Closes #3526719

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