feat: impl hardhat_impersonateAccount and hardhat_stopImpersonationAccount

[grw-ms]

What 💻

• Adds a field impersonated_account: Option<Address> to node; in run_l2_tx method, adjust the tx to have initiator = impersonated account if set. This requires setting self.system_contracts = SystemContracts::from_options(&Options::BuiltInWithoutSecurity) to disable signature verification
• Adds hardhat_impersonateAccount and hardhat_stopImpersonationAccount RPCs

Why ✋

• Allow user to send transactions from arbitrary addresses, useful for testing

Evidence 📷

Notes 📝

• Any suggestions for better tests? We don't have any test for send_raw_transaction- I tried a bit to write one but was quite hard, just re-used apply_txs

[AntonD3]

And actually, it will be impossible to simulate a call from a contract, because of this check: https://github.com/matter-labs/era-system-contracts/blob/main/bootloader/bootloader.yul#L2097. If we want to support such functionality we need to mark the impersonated account as an account here https://github.com/matter-labs/era-system-contracts/blob/main/contracts/ContractDeployer.sol#L25 . WDYT @MexicanAce ?
Update: the problem is even bigger because it's impossible to initiate transactions from not account

[MexicanAce]

Update: the problem is even bigger because it's impossible to initiate transactions from not account

Decided to hold off on addressing this functionality in a follow-up PR

[MexicanAce]

LGTM