refactor(cheatcode): use rate limit args in create fork cheatcode

[Evalir]

Rebases #6085 to use the new file structure and refactor—couldn't rebase online on github and it was going to be a pain. Thanks @gr4yha7!

[mattsse]

we need to add the retry option to the cli args otherwise this will never be set.

This changes the defaults slightly, from 8,800ms to what the default provider is using. I guess we can update the provider defaults instead, 800ms seems more reasonable anyway

and actually, it turns out the no-rate-limit argument was already respected via:

foundry/crates/evm/core/src/opts.rs

Line 169 in c76d372

if self.no_rpc_rate_limit {

[mattsse]

we don't have a correspond cli arg for this like

foundry/crates/common/src/evm.rs

Lines 58 to 63 in c76d372

	/// Initial retry backoff on encountering errors.
	///
	/// See --fork-url.
	#[clap(long, requires = "fork_url", value_name = "BACKOFF")]
	#[serde(skip_serializing_if = "Option::is_none")]
	pub fork_retry_backoff: Option<u64>,

so this will also be None

[mattsse]

lgtm