[Feature] Make TransactionRequest signable

[yash-atreya]

Component

rpc

Describe the feature you would like

Motivation

Currently a TransactionRequest cannot be signed using sign_transaction(signer), in order to do this we have to use the specific tx type we are trying to send from alloy_consensus. See: https://github.com/alloy-rs/examples/pull/129/files#diff-bd449423ea78c0a809dc015e99f4290e3ea5102dbcef24a70351ae6784a4f750R54-R79

Solution

Additional context

No response

[klkvr]

Looks like this is already possible when using NetworkWallet:

alloy/crates/network/src/transaction/signer.rs

Lines 51 to 60 in 2242ac8

	fn sign_request(
	&self,
	request: N::TransactionRequest,
	) -> impl_future!(<Output = alloy_signer::Result<N::TxEnvelope>>) {
	async move {
	let sender = request.from().unwrap_or_else(|| self.default_signer_address());
	let tx = request.build_unsigned().map_err(alloy_signer::Error::other)?;
	self.sign_transaction_from(sender, tx).await
	}
	}

Wondering if we should simplify this somehow?

[Mohiiit]

Hey, Can I pick this up?