add EIP-3860 initcode size check in txpool validation

[DanielGuupta]

Motivation

Contract creation transactions with initcode exceeding 49152 bytes were accepted into the mempool and only rejected at execution time.

Solution

Add the missing EIP-3860 size check in validate_pool_transaction_for so oversized txs are rejected early at eth_sendRawTransaction, consistent with how we handle other fork-aware validations (EIP-1559, EIP-4844).

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[mattsse]

I believe this clashes with settings we have and ideally we want to allow using larger txs

[mattsse]

so I think instead of this we should add a way to make this configurable

[DanielGuupta]

so I think instead of this we should add a way to make this configurable

updated to respect limit_contract_code_size from CfgEnv. Now it follows the EIP-3860 formula (2 * code_size_limit) and is effectively skipped when --disable-code-size-limit is used.

stale