Function run_proxy_with_fallback 

pub async fn run_proxy_with_fallback(
    route_table: Arc<RwLock<HashMap<String, Vec<RouteTarget>>>>,
    wasm_triggers: SharedWasmTriggers,
    wasm_invoker: Option<WasmInvoker>,
    port: u16,
    tls_acceptor: Option<TlsAcceptor>,
    acme_manager: Option<AcmeManager>,
    fallback: Option<FallbackConfig>,
) -> Result<()>

Run the proxy with optional fallback support.