Upstream txtype derive to TransactionRequest

[mattsse]

Describe the feature

we have this:

reth/crates/optimism/rpc/src/eth/call.rs

Lines 70 to 80 in 3ac3e6f

	let tx_type = if request.authorization_list.is_some() {
	TxType::Eip7702
	} else if request.has_eip4844_fields() {
	TxType::Eip4844
	} else if request.has_eip1559_fields() {
	TxType::Eip1559
	} else if request.access_list.is_some() {
	TxType::Eip2930
	} else {
	TxType::Legacy
	} as u8;

reth/crates/rpc/rpc/src/eth/helpers/call.rs

Lines 61 to 71 in 3ac3e6f

	let tx_type = if request.authorization_list.is_some() {
	TxType::Eip7702
	} else if request.has_eip4844_fields() {
	TxType::Eip4844
	} else if request.has_eip1559_fields() {
	TxType::Eip1559
	} else if request.access_list.is_some() {
	TxType::Eip2930
	} else {
	TxType::Legacy
	} as u8;

we can now upstream this to TransactionRequest

as a new function, or maybe this could even be unified with:

https://github.com/alloy-rs/alloy/blob/722f4e95b1980eb4bec4c9ee8d2f3112a3ef92bb/crates/rpc-types-eth/src/transaction/request.rs#L615-L615

Additional context

No response

[fantasyup]

Will do :)