[Hotfix] Extend solver engine request body limit (#2223)

# Description
We are seeing 413 repsonses between the driver and solver engine in
prod. Default limit seems to be 2MB
([docs](https://docs.rs/axum/latest/axum/extract/struct.DefaultBodyLimit.html))

# Changes
- [x] Explicitly set the limit larger (10MB)
- [x] Disable default body limit in axum

## How to test
No longer see 413 errors in shadow

Locally override autopilot to send a sovle request with 3x the orders.
No longer see 413s.

crates/driver/src/infra/api/mod.rs

@@ -83,7 +83,9 @@ impl Api {
             })));
             let path = format!("/{name}");
             infra::observe::mounting_solver(&name, &path);
-            app = app.nest(&path, router);
+            app = app
+                .nest(&path, router)
+                .layer(axum::extract::DefaultBodyLimit::disable());
         }
 
         let make_svc = observe::make_service_with_task_local_storage!(app);

crates/solvers/src/api/mod.rs

@@ -8,6 +8,8 @@ use {
 
 mod routes;
 
+const REQUEST_BODY_LIMIT: usize = 10 * 1024 * 1024;
+
 pub struct Api {
     pub addr: SocketAddr,
     pub solver: Solver,
@@ -20,14 +22,18 @@ impl Api {
         shutdown: impl Future<Output = ()> + Send + 'static,
     ) -> Result<(), hyper::Error> {
         let app = axum::Router::new()
+            .layer(tower::ServiceBuilder::new().layer(
+                tower_http::limit::RequestBodyLimitLayer::new(REQUEST_BODY_LIMIT),
+            ))
             .route("/metrics", axum::routing::get(routes::metrics))
             .route("/healthz", axum::routing::get(routes::healthz))
             .route("/solve", axum::routing::post(routes::solve))
             .route("/notify", axum::routing::post(routes::notify))
             .layer(
                 tower::ServiceBuilder::new().layer(tower_http::trace::TraceLayer::new_for_http()),
             )
-            .with_state(Arc::new(self.solver));
+            .with_state(Arc::new(self.solver))
+            .layer(axum::extract::DefaultBodyLimit::disable());
 
         let make_svc = observe::make_service_with_task_local_storage!(app);