refactor: remove optional class info

[ArniStarkware]

This change is 

[ArniStarkware]

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• refactor: remove optional class info #518 👈
• refactor: create executable tx in the gateway process_tx #517 : 2 other dependent PRs (#519 , #694 )
• chore: define creator for executable transaction #686
• chore: add impl from rpc tx to snapi tx #668
• main

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[ArniStarkware]

crates/gateway/src/stateful_transaction_validator.rs line 78 at r1 (raw file):

            gateway_compiler,
            &self.config.chain_info.chain_id,
        )?;

In #519, we fix the signature of this function.

Code quote:

    pub fn run_validate<V: StatefulTransactionValidatorTrait>(
        &self,
        external_tx: &RpcTransaction,
        gateway_compiler: &GatewayCompiler,
        mut validator: V,
    ) -> StatefulTransactionValidatorResult<ValidateInfo> {
        let account_tx = external_tx_to_account_tx(
            external_tx,
            gateway_compiler,
            &self.config.chain_info.chain_id,
        )?;

[ArniStarkware]

This PR is irrelevant. It was squashed into #519.