feat(eth-multisig-v4): add arbeth and opeth wallet contract #111
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This PR adds support for Arbeth and Opeth. The main change for these chains is that the operation hash prefix must be specific to the chain, to avoid cross-chain replay attacks. For example, on ETH chain it is the
string "ETHER", on Arbitrum chain it is the string "ARBETH", and on Optimism chain it is "OPETH".
WIN-1013