Move EntityHash related types into bevy_ecs (#11498)

# Objective

Reduce the size of `bevy_utils`
(bevyengine/bevy#11478)

## Solution

Move `EntityHash` related types into `bevy_ecs`. This also allows us
access to `Entity`, which means we no longer need `EntityHashMap`'s
first generic argument.

---

## Changelog

- Moved `bevy::utils::{EntityHash, EntityHasher, EntityHashMap,
EntityHashSet}` into `bevy::ecs::entity::hash` .
- Removed `EntityHashMap`'s first generic argument. It is now hardcoded
to always be `Entity`.

## Migration Guide

- Uses of `bevy::utils::{EntityHash, EntityHasher, EntityHashMap,
EntityHashSet}` now have to be imported from `bevy::ecs::entity::hash`.
- Uses of `EntityHashMap` no longer have to specify the first generic
parameter. It is now hardcoded to always be `Entity`.

src/accessibility.rs

@@ -15,23 +15,23 @@ use bevy_a11y::{
 use bevy_a11y::{ActionRequest as ActionRequestWrapper, ManageAccessibilityUpdates};
 use bevy_app::{App, Plugin, PostUpdate};
 use bevy_derive::{Deref, DerefMut};
+use bevy_ecs::entity::EntityHashMap;
 use bevy_ecs::{
     prelude::{DetectChanges, Entity, EventReader, EventWriter},
     query::With,
     schedule::IntoSystemConfigs,
     system::{NonSend, NonSendMut, Query, Res, ResMut, Resource},
 };
 use bevy_hierarchy::{Children, Parent};
-use bevy_utils::EntityHashMap;
 use bevy_window::{PrimaryWindow, Window, WindowClosed};
 
 /// Maps window entities to their `AccessKit` [`Adapter`]s.
 #[derive(Default, Deref, DerefMut)]
-pub struct AccessKitAdapters(pub EntityHashMap<Entity, Adapter>);
+pub struct AccessKitAdapters(pub EntityHashMap<Adapter>);
 
 /// Maps window entities to their respective [`WinitActionHandler`]s.
 #[derive(Resource, Default, Deref, DerefMut)]
-pub struct WinitActionHandlers(pub EntityHashMap<Entity, WinitActionHandler>);
+pub struct WinitActionHandlers(pub EntityHashMap<WinitActionHandler>);
 
 /// Forwards `AccessKit` [`ActionRequest`]s from winit to an event channel.
 #[derive(Clone, Default, Deref, DerefMut)]

src/winit_windows.rs

@@ -5,7 +5,8 @@ use bevy_a11y::{
 };
 use bevy_ecs::entity::Entity;
 
-use bevy_utils::{tracing::warn, EntityHashMap, HashMap};
+use bevy_ecs::entity::EntityHashMap;
+use bevy_utils::{tracing::warn, HashMap};
 use bevy_window::{CursorGrabMode, Window, WindowMode, WindowPosition, WindowResolution};
 
 use winit::{
@@ -25,7 +26,7 @@ pub struct WinitWindows {
     /// Stores [`winit`] windows by window identifier.
     pub windows: HashMap<winit::window::WindowId, winit::window::Window>,
     /// Maps entities to `winit` window identifiers.
-    pub entity_to_winit: EntityHashMap<Entity, winit::window::WindowId>,
+    pub entity_to_winit: EntityHashMap<winit::window::WindowId>,
     /// Maps `winit` window identifiers to entities.
     pub winit_to_entity: HashMap<winit::window::WindowId, Entity>,
     // Many `winit` window functions (e.g. `set_window_icon`) can only be called on the main thread.