Prewarm wasm workers before accepting requests

src/wasm/backend.cpp

@@ -88,6 +88,11 @@ static String wasm_backend_ensure_started(Request* context)
 	return("");
 }
 
+String wasm_backend_start(Request& request)
+{
+	return(wasm_backend_ensure_started(&request));
+}
+
 static bool wasm_artifact_exists(Request* context, const String& entry_unit)
 {
 	if(entry_unit == "")