L1: Limit transactions message byte-size

[fkrause98]

Issue

As of writing this, there's an upper limit to how many transactions can be received in a single P2P message (256),
we should also have a limit on how big the sent and received transactions messages should be, based on their byte-size.

Check ethereum_rust/crates/networking/p2p/rlpx/eth/transactions.rs for more context.