Reuse Eip712Doman during multichain action estimation

[mattsse]

this loop is quite heavy:

relay/src/rpc/relay.rs

Line 1254 in 77959c6

for _ in 0..3 {

we do

relay/src/rpc/relay.rs

Lines 1331 to 1335 in 77959c6

	// Compute EIP-712 digest (settlement_id)
	let (output_intent_digest, _) = output_quote
	.intent
	.compute_eip712_data(
	output_quote.orchestrator,

per iteration which always needs to recompute the domain:

relay/src/types/intent.rs

Line 476 in 77959c6

let domain = orchestrator.eip712_domain(self.is_multichain()).await?;

the domain should be the same because this is multichain

maybe we could either cache this with some timeout or at least reduce this call to once per request

relay/src/types/orchestrator.rs

Lines 282 to 285 in 96f9aea

	pub async fn eip712_domain(&self, multichain: bool) -> TransportResult<Eip712Domain> {
	let domain = self
	.orchestrator
	.eip712Domain()