Caching the `zkeyfiles` in the service worker

[0xisk]

trafficstars

Upload files to CND (aws) and download them on demand and keep locally for user

We should consider caching zkey and wasm files in aws

Having a figure point hash for the zkey files stored inside the extension and then user would be able to verify the fetched wasm.

[0xisk]

Kind of data that could be stored in the extension storage.

Primitive values such as numbers will serialize as expected. 
Values with a typeof "object" and "function" will typically serialize to {}, with the exception of Array (serializes as expected), 
Date, and Regex (serialize using their String representation).