[EVM Reader] Check Inputbox contract on Startup

[fmoura]

📚 Context

EVM Reader reads inputs from a InputBox contract. But it do not verify if the contract is actually deployed or it is at the specified block. It should check and fail if the contract is absent or the informed inputBoxDeplymentBlockNumber is actually different from the actual one

✔️ Solution

Add a check at Evm Reader Service start

[fmoura]

A complete check is not feasible using current Devnet, as Anvil has a bug related to eth_getCode when Anvil starts with--load-state. I opened a issue on Foundry Github repo

This bug prevents checking a contract on a specific block that is part of the loaded state

[tuler]

You don't need to specify the block to getCode (even if you can). Only getCode is a "complete" check.

[fmoura]

We actually wants to check two things:

• If the inputbox contract exists
• If the informed input box deployment block is correct.

for the latter we need to check the code at the specified block.