J. Cliff Dyer 4946b6b296 Track viewing of individual blocks. ...

* Implement a ViewedEvent handling system which calls handlers when a
  block has been viewed for 5 seconds (configurable).
* Hook up Verticals to register their children blocks with this event,
  and submit completions once seen.

OSPR-2093
OC-3358

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..

spec

Track viewing of individual blocks.

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.eslintrc.js

Track viewing of individual blocks.

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ViewedEvent.js

Track viewing of individual blocks.

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