feat: make payload builder generic over attributes type (#5948)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/node-builder/src/engine.rs

@@ -0,0 +1,23 @@
+use reth_node_api::EngineTypes;
+use reth_payload_builder::{EthPayloadBuilderAttributes, OptimismPayloadBuilderAttributes};
+use reth_rpc_types::engine::{OptimismPayloadAttributes, PayloadAttributes};
+
+/// The types used in the default mainnet ethereum beacon consensus engine.
+#[derive(Debug, Default, Clone)]
+#[non_exhaustive]
+pub struct EthEngineTypes;
+
+impl EngineTypes for EthEngineTypes {
+    type PayloadAttributes = PayloadAttributes;
+    type PayloadBuilderAttributes = EthPayloadBuilderAttributes;
+}
+
+/// The types used in the optimism beacon consensus engine.
+#[derive(Debug, Default, Clone)]
+#[non_exhaustive]
+pub struct OptimismEngineTypes;
+
+impl EngineTypes for OptimismEngineTypes {
+    type PayloadAttributes = OptimismPayloadAttributes;
+    type PayloadBuilderAttributes = OptimismPayloadBuilderAttributes;
+}

crates/node-builder/src/lib.rs

@@ -0,0 +1,13 @@
+//! Standalone crate for Reth configuration and builder types.
+
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/paradigmxyz/reth/main/assets/reth-docs.png",
+    html_favicon_url = "https://avatars0.githubusercontent.com/u/97369466?s=256",
+    issue_tracker_base_url = "https://github.com/paradigmxyz/reth/issues/"
+)]
+#![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
+
+/// Exports commonly used concrete instances of the [EngineTypes](reth_node_api::EngineTypes)
+/// trait.
+pub mod engine;
+pub use engine::{EthEngineTypes, OptimismEngineTypes};