Support getAccount mode

[mattsse]

with alloy-rs/alloy#2402 we have a way to fetch the entire account info which would do these 3 requests

foundry-fork-db/src/backend.rs

Lines 287 to 289 in 676446a

	let balance = provider.get_balance(address).block_id(block_id).into_future();
	let nonce = provider.get_transaction_count(address).block_id(block_id).into_future();
	let code = provider.get_code_at(address).block_id(block_id).into_future();

in one request

however this isn't supported by all clients, so we need to introduce some kind of

enum GetAccountMode {
    /// The provider supports `eth_getAccountInfo`
    EthGetAccountInfo,
    /// It doesn't support, and we have to fetch balance, nonce, and code concurrently
    AccountCodeNonce,
}

and the first time we send an account request we try to also fetch the acc info via eth_getAccountInfo if this doesn't return an error we can use this fn for future requests

TODO

• add mode enum
• implement this logic, so we need to track the state wich mode should be used in the BackendHandler type

[Rimeeeeee]

May I look into this :)