Add Opstack engine api jsonrpsee trait

[mattsse]

Describe the feature

same as

reth/crates/rpc/rpc-api/src/engine.rs

Line 41 in 544fd50

pub trait EngineApi<Engine: EngineTypes> {

but with Opstack types for newPayload v4, we can now then also exclude the v1 endpoints

this should be added to the optimism rpc crate probably.

I also think now that we're splitting those, we no longer need the T: EngineTypes generic on that trait.

Additional context

#13145

[emhane]

can we reuse this somehow ? https://github.com/alloy-rs/op-alloy/blob/d5e41e51d96857635eff251aea69156a32809c92/crates/provider/src/ext/engine.rs#L13-L179

[emhane]

will open issue to address the redundancy with above trait at later time point in order not to block this issue which is critical for isthmus l2 withdrawals root feature

[mattsse]

most of the functions yes, but we need an jsonrpsee trait for this

will open issue to address the redundancy

there is none, this op-alloy trait is for alloy provider, client side

[emhane]

working on this now, copying OpEngineApi from op-alloy as base to unblock isthmus feature