fix: use parent.state when kakarot fetches from starknet

[ClementWalter]

Why

In the kakarot implementation, we use Starknet contract storage as the backend for data and fetch data on the fly when required.

Since we don't need to use nor mimic the starknet storage in keth, but the initial state of the program is populated in a hint, we can use the parent.state instead.

What

Use message.parent.state to read values from the state as it is before the tx.