impl ExclusiveSystemParam for WorldId (#11164)

# Objective

Mostly for consistency.

## Solution

```rust
impl ExclusiveSystemParam for WorldId
```

- Also add a test for `SystemParam for WorldId`

## Changelog
Added: Worldd now implements ExclusiveSystemParam.

crates/bevy_ecs/src/world/identifier.rs

@@ -1,3 +1,4 @@
+use crate::system::{ExclusiveSystemParam, SystemMeta};
 use crate::{
     component::Tick,
     storage::SparseSetIndex,
@@ -65,6 +66,19 @@ unsafe impl SystemParam for WorldId {
     }
 }
 
+impl ExclusiveSystemParam for WorldId {
+    type State = WorldId;
+    type Item<'s> = WorldId;
+
+    fn init(world: &mut World, _system_meta: &mut SystemMeta) -> Self::State {
+        world.id()
+    }
+
+    fn get_param<'s>(state: &'s mut Self::State, _system_meta: &SystemMeta) -> Self::Item<'s> {
+        *state
+    }
+}
+
 impl SparseSetIndex for WorldId {
     #[inline]
     fn sparse_set_index(&self) -> usize {
@@ -95,6 +109,30 @@ mod tests {
         }
     }
 
+    #[test]
+    fn world_id_system_param() {
+        fn test_system(world_id: WorldId) -> WorldId {
+            world_id
+        }
+
+        let mut world = World::default();
+        let system_id = world.register_system(test_system);
+        let world_id = world.run_system(system_id).unwrap();
+        assert_eq!(world.id(), world_id);
+    }
+
+    #[test]
+    fn world_id_exclusive_system_param() {
+        fn test_system(_world: &mut World, world_id: WorldId) -> WorldId {
+            world_id
+        }
+
+        let mut world = World::default();
+        let system_id = world.register_system(test_system);
+        let world_id = world.run_system(system_id).unwrap();
+        assert_eq!(world.id(), world_id);
+    }
+
     // We cannot use this test as-is, as it causes other tests to panic due to using the same atomic variable.
     // #[test]
     // #[should_panic]