Change evm_env_cache to header cache

[mattsse]

Describe the feature

This currently bakes in the revm environments into caching:

reth/crates/rpc/rpc-eth-types/src/cache/mod.rs

Lines 240 to 241 in 51afa4c

	/// The LRU cache for revm environments
	evm_env_cache: EnvLruCache<LimitEnvs>,

this will no longer with with upcoming revm changes where these settings will be generic, or if we want to support something that is not revm, like a different kind of execution.

The environment settings are derived from the header:

reth/crates/evm/src/provider.rs

Lines 28 to 37 in 51afa4c

	/// Fills the default [`CfgEnvWithHandlerCfg`] and [BlockEnv] fields with values specific to the
	/// given [Header].
	fn env_with_header<EvmConfig>(
	&self,
	header: &Header,
	evm_config: EvmConfig,
	) -> ProviderResult<(CfgEnvWithHandlerCfg, BlockEnv)>
	where
	EvmConfig: ConfigureEvmEnv<Header = Header>,
	{

so what we can do here is:
first change the cache from caching env objects to Header and convert the environments on demand

this is only called here:

reth/crates/rpc/rpc-eth-api/src/helpers/state.rs

Line 238 in 51afa4c

.get_evm_env(block_hash)

so as a first step we can do is change the cache to Header,
and move this step:

reth/crates/rpc/rpc-eth-types/src/cache/mod.rs

Lines 441 to 453 in 51afa4c

	let mut cfg = CfgEnvWithHandlerCfg::new_with_spec_id(
	CfgEnv::default(),
	SpecId::LATEST,
	);
	let mut block_env = BlockEnv::default();
	let res = provider
	.fill_env_at(
	&mut cfg,
	&mut block_env,
	block_hash.into(),
	evm_config,
	)
	.map(|_| (cfg, block_env));

Additional context

No response

[lakshya-sky]

@mattsse I would like to work on this?

[mattsse]

cool, assigned