* op-service: split EngineAPIClient out of EngineClient

This way, the Engine API RPC client can be reused in other components, like op-wheel.

* op-service/eth: Add BlockAsPayloadEnv

* op-wheel: Use new Engine API V3 calls

* op-wheel: Add rewind command

Also adds an open RCP endpoint because the "debug" rpc namespace is not
available on the authenticated endpoint.

This also fixes chain config loading.

Also sets some sane default http RPC endpoints.

* op-wheel: Move engine.version validation into flag Action

* op-wheel: improve rewind command