PROTOTYPE: Shared worker for retrieving and storing Telemetry Dictionary

[jvigliotta]

Closes

Describe your changes:

Have created a shared worker that will store the Telemetry Dictionary, once it's been retrieved. Any other tabs will be able to pull the dictionary from the shared worker, negating any need to make further requests. This reduces additional tabs on page load requests by about 30 to 40. The dictionary is instantly available.

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