Replace bevy_utils::CowArc with atomicow (#14977)

# Objective

- Fixes #14975

## Solution

- Replace usages of `bevy_utils::CowArc` with `atomicow::CowArc`
- Remove bevy_utils::CowArc

## Testing

- `bevy_asset` test suite continues to pass.

---

## Migration Guide

`bevy_utils::CowArc` has moved to a new crate called
[atomicow](https://crates.io/crates/atomicow).

crates/bevy_asset/Cargo.toml

@@ -29,6 +29,7 @@ bevy_tasks = { path = "../bevy_tasks", version = "0.15.0-dev" }
 bevy_utils = { path = "../bevy_utils", version = "0.15.0-dev" }
 
 stackfuture = "0.3"
+atomicow = "1.0"
 async-broadcast = "0.5"
 async-fs = "2.0"
 async-lock = "3.0"

crates/bevy_asset/src/io/source.rs

@@ -2,9 +2,10 @@ use crate::{
  io::{processor_gated::ProcessorGatedReader, AssetSourceEvent, AssetWatcher},
  processor::AssetProcessorData,
 };
+use atomicow::CowArc;
 use bevy_ecs::system::Resource;
 use bevy_utils::tracing::{error, warn};
-use bevy_utils::{CowArc, Duration, HashMap};
+use bevy_utils::{Duration, HashMap};
 use std::{fmt::Display, hash::Hash, sync::Arc};
 use thiserror::Error;
 

crates/bevy_asset/src/loader.rs

@@ -6,8 +6,9 @@ use crate::{
  Asset, AssetLoadError, AssetServer, AssetServerMode, Assets, Handle, UntypedAssetId,
  UntypedHandle,
 };
+use atomicow::CowArc;
 use bevy_ecs::world::World;
-use bevy_utils::{BoxedFuture, ConditionalSendFuture, CowArc, HashMap, HashSet};
+use bevy_utils::{BoxedFuture, ConditionalSendFuture, HashMap, HashSet};
 use downcast_rs::{impl_downcast, Downcast};
 use ron::error::SpannedError;
 use serde::{Deserialize, Serialize};

crates/bevy_asset/src/path.rs

@@ -1,6 +1,6 @@
 use crate::io::AssetSourceId;
+use atomicow::CowArc;
 use bevy_reflect::{Reflect, ReflectDeserialize, ReflectSerialize};
-use bevy_utils::CowArc;
 use serde::{de::Visitor, Deserialize, Serialize};
 use std::{
  fmt::{Debug, Display},

crates/bevy_asset/src/saver.rs

@@ -1,7 +1,8 @@
 use crate::transformer::TransformedAsset;
 use crate::{io::Writer, meta::Settings, Asset, ErasedLoadedAsset};
 use crate::{AssetLoader, Handle, LabeledAsset, UntypedHandle};
-use bevy_utils::{BoxedFuture, ConditionalSendFuture, CowArc, HashMap};
+use atomicow::CowArc;
+use bevy_utils::{BoxedFuture, ConditionalSendFuture, HashMap};
 use serde::{Deserialize, Serialize};
 use std::{borrow::Borrow, hash::Hash, ops::Deref};
 

crates/bevy_asset/src/server/mod.rs

@@ -17,10 +17,11 @@ use crate::{
  DeserializeMetaError, ErasedLoadedAsset, Handle, LoadedUntypedAsset, UntypedAssetId,
  UntypedAssetLoadFailedEvent, UntypedHandle,
 };
+use atomicow::CowArc;
 use bevy_ecs::prelude::*;
 use bevy_tasks::IoTaskPool;
 use bevy_utils::tracing::{error, info};
-use bevy_utils::{CowArc, HashSet};
+use bevy_utils::HashSet;
 use crossbeam_channel::{Receiver, Sender};
 use futures_lite::{FutureExt, StreamExt};
 use info::*;

crates/bevy_asset/src/transformer.rs

@@ -1,5 +1,6 @@
 use crate::{meta::Settings, Asset, ErasedLoadedAsset, Handle, LabeledAsset, UntypedHandle};
-use bevy_utils::{ConditionalSendFuture, CowArc, HashMap};
+use atomicow::CowArc;
+use bevy_utils::{ConditionalSendFuture, HashMap};
 use serde::{Deserialize, Serialize};
 use std::{
  borrow::Borrow,

crates/bevy_utils/src/lib.rs

@@ -21,7 +21,6 @@ pub use short_names::get_short_name;
 pub mod synccell;
 pub mod syncunsafecell;
 
-mod cow_arc;
 mod default;
 mod object_safe;
 pub use object_safe::assert_object_safe;
@@ -30,7 +29,6 @@ mod parallel_queue;
 
 pub use ahash::{AHasher, RandomState};
 pub use bevy_utils_proc_macros::*;
-pub use cow_arc::*;
 pub use default::default;
 pub use hashbrown;
 pub use parallel_queue::*;