replace Payloadloadbuilder::on_missing_payload with a type that tells the service how to behave

[mattsse]

Describe the feature

reth/crates/optimism/payload/src/builder.rs

Lines 87 to 90 in 40d8ac0

	fn on_missing_payload(
	&self,
	args: BuildArguments<Pool, Client, OptimismPayloadBuilderAttributes, OptimismBuiltPayload>,
	) -> Option<OptimismBuiltPayload> {

is a hook that is invoked when the CL requests the payload and the payload is still unavailable.

The reason this exists is want to give the payload builder a chance to react here and prevent building an empty payload.

however this currently can result redundant work for OP payload building because this effectively rebuilds the block in place instead of awaiting the wip payload.

this can easily replaced with an enum with following variants:

enum MissingPayloadBehaviour {
   AwaitInprogress,
   RaceBuildEmpty,
   UsePayload(Self::BuiltPayload)
}

for OP we want to use the AwaitInprogress variant

Additional context

No response