feat[contracts]: enable initiating L2 upgrade via L1 to L2 message#854

smartcontracts wants to merge 2 commits intov0.4.0-rcethereum-optimism/optimism:v0.4.0-rcfrom

kelvin/l2-upgrade-xdomain-initethereum-optimism/optimism:kelvin/l2-upgrade-xdomain-initCopy head branch name to clipboard