Add literals bench

src/test.cpp

@@ -467,4 +467,14 @@ TEST_CASE("bench input types") {
                                               0
                                               ]
   )");
+  bench("literals", R"([
+true, false, null,
+true, false, null,
+true, false, null,
+true, false, null,
+true, false, null,
+true, false, null,
+true, false, null
+]
+  )");
 }