Description

In Capella we can finally improve payload construction by fetching multiple payloads from the execution node at a time: ethereum/execution-apis#352.

The capella branch doesn't yet support this. @ethDreamer had a previous prototype working with Nethermind which could probably be adapted.

This isn't essential for Capella interop, but could be one of the finishing touches developed during/after interop.

Steps to resolve

I think we could probably just start with adding getPayloadBodiesByRangeV1, as that's where the main benefit lies. We can enable this under the same conditions as other Capella methods (capella_fork_epoch.is_some()) or add a runtime flag if EL support is initially patchy.