feat(node-builder): add install_exex to WithLaunchContext (#7514)

crates/node-builder/src/builder.rs

@@ -1061,6 +1061,26 @@ where
         self
     }
 
+    /// Installs an ExEx (Execution Extension) in the node.
+    pub fn install_exex<F, R, E>(mut self, exex: F) -> Self
+    where
+        F: Fn(
+                ExExContext<
+                    FullNodeComponentsAdapter<
+                        FullNodeTypesAdapter<Types, DB, RethFullProviderType<DB, Types::Evm>>,
+                        Components::Pool,
+                    >,
+                >,
+            ) -> R
+            + Send
+            + 'static,
+        R: Future<Output = eyre::Result<E>> + Send,
+        E: Future<Output = eyre::Result<()>> + Send,
+    {
+        self.builder.state.exexs.push(Box::new(exex));
+        self
+    }
+
     /// Launches the node and returns a handle to it.
     pub async fn launch(
         self,