Run Iris examples on desktop and Android

examples/bench_images/lib.rs

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+use iris::prelude::*;
+
+const ROWS: usize = 1000;
+
+pub(crate) fn build<Rsc: UiRsc>(
+    rsc: &mut Rsc,
+    ui_state: &mut impl HasRoot<Rsc>,
+) -> WeakWidget<Span> {
+    let mut span = Span::empty(Dir::DOWN);
+    for _ in 0..ROWS {
+        let img = iris::image::DynamicImage::new_rgba8(32, 32);
+        let widget = image::<Rsc>(img)(rsc);
+        let widget = rsc.ui_mut().widgets.add_strong(widget);
+        span.push(widget.any());
+    }
+    let span = rsc.ui_mut().widgets.add_strong(span);
+    let span_weak = span.weak();
+    let root = rsc
+        .ui_mut()
+        .widgets
+        .add_strong(ScrollArea::new(span.any(), Axis::Y, Pin::End));
+    ui_state.set_root(rsc, root.any());
+    span_weak
+}