refactor: move node-core/engine to standalone crate (#9120)

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

crates/engine/util/Cargo.toml

@@ -0,0 +1,42 @@
+[package]
+name = "reth-engine-util"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+homepage.workspace = true
+repository.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+# reth
+reth-fs-util.workspace = true
+reth-rpc.workspace = true
+reth-rpc-types.workspace = true
+reth-engine-primitives.workspace = true
+reth-beacon-consensus.workspace = true
+
+# async
+tokio-util.workspace = true
+pin-project.workspace = true
+
+# misc
+eyre.workspace = true
+
+# io
+serde.workspace = true
+serde_json.workspace = true
+
+# tracing
+tracing.workspace = true
+
+# async
+futures.workspace = true
+
+[features]
+optimism = [
+    "reth-rpc/optimism",
+    "reth-beacon-consensus/optimism",
+]