feat: add code hash to the Account storage

@ClementWalter An other solution instead of adding it to the Account storage and having to do a read of storage would be to store it in the state hence modify the model.Account with a new field codeHash It will allow to retrieve the cached value (computed at creation) directly with let account = State.get_account(evm_address); here
The codehash is also necessary for the account trie computation hence will need to be added anyway

https://ethereum.org/en/developers/docs/data-structures-and-encoding/patricia-merkle-trie/#state-trie

State Trie There is one global state trie, and it is updated every time a client processes a block. In it, a path is always: keccak256(ethereumAddress) and a value is always: rlp(ethereumAccount). More specifically an ethereum account is a 4 item array of [nonce,balance,storageRoot,codeHash]. At this point, it's worth noting that this storageRoot is the root of another patricia trie

Though this solution would mean compute the codeHash at each execution. So this might not be ideal for starknet. It seems both will need to be implemented at some point.

Update: working on the first solution as it makes more sense for starknet

kkrt-labs / kakarot

feat: add code hash to the Account storage #1267

Feature Request

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