feat(engine): add engine_getPayloadV5 skeleton (#16270)

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

Author: rkrasiuk

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

@@ -166,6 +166,19 @@ pub trait EngineApi<Engine: EngineTypes> {
         payload_id: PayloadId,
     ) -> RpcResult<Engine::ExecutionPayloadEnvelopeV4>;
 
+    /// Post Osaka payload handler.
+    ///
+    /// See also <https://github.com/ethereum/execution-apis/blob/15399c2e2f16a5f800bf3f285640357e2c245ad9/src/engine/osaka.md#engine_getpayloadv5>.
+    ///
+    /// Returns the most recent version of the payload that is available in the corresponding
+    /// payload build process at the time of receiving this call. Note:
+    /// > Provider software MAY stop the corresponding build process after serving this call.
+    #[method(name = "getPayloadV5")]
+    async fn get_payload_v5(
+        &self,
+        payload_id: PayloadId,
+    ) -> RpcResult<Engine::ExecutionPayloadEnvelopeV5>;
+
     /// See also <https://github.com/ethereum/execution-apis/blob/6452a6b194d7db269bf1dbd087a267251d3cc7f8/src/engine/shanghai.md#engine_getpayloadbodiesbyhashv1>
     #[method(name = "getPayloadBodiesByHashV1")]
     async fn get_payload_bodies_by_hash_v1(

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

@@ -1015,6 +1015,23 @@ where
         Ok(self.get_payload_v4_metered(payload_id).await?)
     }
 
+    /// Handler for `engine_getPayloadV5`
+    ///
+    /// Returns the most recent version of the payload that is available in the corresponding
+    /// payload build process at the time of receiving this call.
+    ///
+    /// See also <https://github.com/ethereum/execution-apis/blob/15399c2e2f16a5f800bf3f285640357e2c245ad9/src/engine/osaka.md#engine_getpayloadv5>
+    ///
+    /// Note:
+    /// > Provider software MAY stop the corresponding build process after serving this call.
+    async fn get_payload_v5(
+        &self,
+        _payload_id: PayloadId,
+    ) -> RpcResult<EngineT::ExecutionPayloadEnvelopeV5> {
+        trace!(target: "rpc::engine", "Serving engine_getPayloadV5");
+        Err(internal_rpc_err("unimplemented"))
+    }
+
     /// Handler for `engine_getPayloadBodiesByHashV1`
     /// See also <https://github.com/ethereum/execution-apis/blob/6452a6b194d7db269bf1dbd087a267251d3cc7f8/src/engine/shanghai.md#engine_getpayloadbodiesbyhashv1>
     async fn get_payload_bodies_by_hash_v1(