[Feature] Impl `TransactionRequest::preferred_type` for new type `OpTransactionRequest`

[emhane]

Component

rpc

Describe the feature you would like

Impl OpTransactionRequest::preferred_type which should cover OpTxType::Deposit variant.

https://github.com/alloy-rs/alloy/blob/a33937d9f4a1c67d5ea06e8eb9ad443ffde900f7/crates/rpc-types-eth/src/transaction/request.rs#L519-L539

Additional context

Blocked by #27

No response

[emhane]

actually, do we need to rebuild the whole OpTransactionRequest type: add deposit remove 4844? @refcell

[Himess]

Is it live @emhane ?