Add READ_ONLY flag to contract call function (#4418)
This PR implements the `READ_ONLY` flag to be used as a `Callflag` in the `call` function. The flag indicates that the callee is restricted from modifying the state during call execution. It is equivalent to Ethereum's [STATICCALL](https://eips.ethereum.org/EIPS/eip-214). --------- Co-authored-by: command-bot <> Co-authored-by:Andrew Jones <ascjones@gmail.com> Co-authored-by:
Alexander Theißen <alex.theissen@me.com>
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