Bytecode hash, remove override_spec,

[rakita]

Save hash of bytecode inside Bytecode structure, this is allowing us to have hash ready and not calculate it every time.

Remove override_spec and move configuration to env.cfg

and small cleanup.

[rakita]

Foundry (forge test) just got even faster

previous graph:

new graph:

is_success is not existing, as in the new version calculation of bytecode hash is only done once.