seth: add Optimistic Ethereum and Arbitrum Support #781
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provide optimistic ethereum (mainnet and kovan) and arbitrum (mainnet) support for
sethand update relevant documentationHow this has been tested
ETH_RPC_URLto an to the relevant infura endpointseth chainreturns the correct chainseth chain-idreturns10(https://chainid.link/?network=optimism for verification)seth block-numberreturned the latest block (check relevant explorer to confirm)seth block 0returns the same info as making the infura call toeth_getBlockByNumberwith params["0x0", true]Could also add arbitrum rinkeby support, but i'm not aware of whether there is an etherscan api compatible explorer for it.