bevy_render: Batch insertion for prepare_uniform_components (bevyengi…

…ne#4179)

# Objective

- Make insertion of uniform components faster

## Solution

- Use batch insertion in the prepare_uniform_components system
- Improves `many_cubes -- sphere` from ~42fps to ~43fps


Co-authored-by: François <mockersf@gmail.com>

crates/bevy_render/src/render_component.rs

@@ -111,14 +111,19 @@ fn prepare_uniform_components<C: Component>(
     C: AsStd140 + Clone,
 {
     component_uniforms.uniforms.clear();
-    for (entity, component) in components.iter() {
-        commands
-            .get_or_spawn(entity)
-            .insert(DynamicUniformIndex::<C> {
-                index: component_uniforms.uniforms.push(component.clone()),
-                marker: PhantomData,
-            });
-    }
+    let entities = components
+        .iter()
+        .map(|(entity, component)| {
+            (
+                entity,
+                (DynamicUniformIndex::<C> {
+                    index: component_uniforms.uniforms.push(component.clone()),
+                    marker: PhantomData,
+                },),
+            )
+        })
+        .collect::<Vec<_>>();
+    commands.insert_or_spawn_batch(entities);
 
     component_uniforms
         .uniforms