Reduce provider RPC requests

[mds1]

This should significantly reduce the number of eth_chainId calls we see to Infura. More info in the ethers docs:

An ethers Provider will execute frequent getNetwork calls to ensure the network calls and network being communicated with are consistent.

In the case of a client like MetaMask, this is desired as the network may be changed by the user at any time, in such cases the cost of checking the chainId is local and therefore cheap.

However, there are also many times where it is known the network cannot change, such as when connecting to an INFURA endpoint, in which case, the StaticJsonRpcProvider can be used which will indefinitely cache the chain ID, which can reduce network traffic and reduce round-trip queries for the chain ID.

This Provider should only be used when it is known the network cannot change.

Related issue with more info: ethers-io/ethers.js#901

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