Style: forbid .zip and .chain (#8188)

The `zip(a, b)` variant produces clearer code imho.

Downside: added dependency on `itertools`

crates/egui-wgpu/src/winit.rs

@@ -715,7 +715,7 @@ impl Painter {
             let start = web_time::Instant::now();
             render_state
                 .queue
-                .submit(user_cmd_bufs.into_iter().chain([encoded]));
+                .submit(std::iter::chain(user_cmd_bufs, [encoded]));
             vsync_sec += start.elapsed().as_secs_f32();
         };