impl Reflect for EntityHashSet (#12971)

`EntityHashSet` doesn't seem to implement `Reflect` which seems weird!
Especially since `EntityHashMap` implements `Reflect`.

This PR just added an extra `impl_reflect_value!` for `EntityHashSet`
and this seems to do the trick.

I left out doing the same for `StableHashSet` since it's marked as
deprecated.

---

I'm really wondering what was the issue here. If anyone can explain why
`EntityHashSet` can't use the `Reflect` impl of `bevy_utils::HashSet`
similar to how it's the case with the `...HashMap`s I'd be interested!

Author: RobWalt

crates/bevy_reflect/src/impls/std.rs

@@ -102,7 +102,7 @@ impl_reflect_value!(
 );
 impl_reflect_value!(::std::collections::BTreeSet<T: Ord + Eq + Clone + Send + Sync>());
 impl_reflect_value!(::std::collections::HashSet<T: Hash + Eq + Clone + Send + Sync, S: TypePath + Clone + Send + Sync>());
-impl_reflect_value!(::bevy_utils::HashSet<T: Hash + Eq + Clone + Send + Sync>());
+impl_reflect_value!(::bevy_utils::hashbrown::HashSet<T: Hash + Eq + Clone + Send + Sync, S: TypePath + Clone + Send + Sync>());
 impl_reflect_value!(::core::ops::Range<T: Clone + Send + Sync>());
 impl_reflect_value!(::core::ops::RangeInclusive<T: Clone + Send + Sync>());
 impl_reflect_value!(::core::ops::RangeFrom<T: Clone + Send + Sync>());
@@ -220,6 +220,10 @@ impl_reflect_value!(::std::ffi::OsString(
 impl_reflect_value!(::std::ffi::OsString(Debug, Hash, PartialEq));
 impl_reflect_value!(::alloc::collections::BinaryHeap<T: Clone>);
 
+impl_type_path!(::bevy_utils::NoOpHash);
+impl_type_path!(::bevy_utils::EntityHash);
+impl_type_path!(::bevy_utils::FixedState);
+
 macro_rules! impl_reflect_for_veclike {
     ($ty:path, $insert:expr, $remove:expr, $push:expr, $pop:expr, $sub:ty) => {
         impl<T: FromReflect + TypePath + GetTypeRegistration> List for $ty {
@@ -629,7 +633,6 @@ impl_type_path!(::std::collections::HashMap<K, V, S>);
 
 impl_reflect_for_hashmap!(bevy_utils::hashbrown::HashMap<K, V, S>);
 impl_type_path!(::bevy_utils::hashbrown::hash_map::DefaultHashBuilder);
-impl_type_path!(::bevy_utils::NoOpHash);
 impl_type_path!(::bevy_utils::hashbrown::HashMap<K, V, S>);
 
 impl<K, V> Map for ::std::collections::BTreeMap<K, V>