Async chain state side effects from confidential execution

[Ruteri]

I propose to change how chain transition based on confidential requests is handled: it should be done based on messages generated by the confidential request instead of the return statement.

Link to collective post: https://collective.flashbots.net/t/async-chain-state-transition-using-messages/2733.

Naming subject to change.

[dmarzzz]

left comments on the forum https://collective.flashbots.net/t/async-chain-state-transition-using-messages/2733/5