feat(sidecar): comprehensive transaction validation

[mempirate]

Context

We currently do some initial transaction verification like nonce, balance and basefee checks, but this is not enough. See https://github.com/paradigmxyz/reth/blob/2d592125128c3742ff97b321884f93f9063abcb2/crates/transaction-pool/src/validate/eth.rs#L155 for reference.

We can do this in a couple ways:

• Implement the reth EthTransactionValidator somehow (only works if it doesn't need access to state DB)
• Use the EL json-rpc to somehow validate incoming transactions beyond what the sidecar does