Composable Block executor

[mattsse]

Currently we have a lot of semi duplicated code in both the OP and Eth (Batch)Executor

reth/crates/ethereum/evm/src/execute.rs

Line 352 in da6b1e7

impl<EvmConfig, DB> Executor<DB> for EthBlockExecutor<EvmConfig, DB>

reth/crates/optimism/evm/src/execute.rs

Line 332 in da6b1e7

impl<EvmConfig, DB> Executor<DB> for OpBlockExecutor<EvmConfig, DB>

the only thing that's really different is how system transactions are executed.

we assume block execution follows this pattern:

1. configure environment
2. apply pre system txs
3. execute block txs
4. apply post system txs

Ideally all of those are composable.
if we can make this composable like have something that can execute system txs #10955 then we can make the executor generic over something that only focuses on these things and we can remove a ton of boilerplate.

one idea

trait E {
  fn apply_pre
  fn execute_txs
  fn apply_post
} 

we could then create one general purpose executor that implements the Executor trait and wraps this new one. so that implementers only need to implement the raw execution functions.

perhaps we can also make some simplifications to the Executor trait itself

[mattsse]

ideally we can use this to validate design: #9497