fix(extension): #32: save chainIn in localstorage

[VanishMax]

Closes #32

Stores chainId in chrome extension storage on RPC change, so it doesn't require a request from the service worker later.

Decided to store chainId instead of params since the only used property from AppParameters is chainId

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[Valentine1898]

The thing is that chain_id can change not only when the user changes the RPC
When a new version of the testnet is released, the chain_id changes, but the RPC remains the same

[VanishMax]

Closing as it is duplicated by #65