* record a tracks event when merchant toggles cart shipping calculator:
- add tracks utility func for blocks
- adds standard event name prefix
- supplies post id & type params (an example)
- hook this up to UI when user toggles shipping calc
- pass enabled as boolean prop
* fix typo - call isTracksAvailable() !
* remove unnecessary temporary boolean
* update event name based on best practice guidelines
* remove isTracksAvailable preflight check:
- if site opts out, recordEvent is an empty function
- add in standard fallback boilerplate to ensure function exists
Note: currently no mechanism to detect if tracks is available on front end.
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