feat: add Localization extensions

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Localization.meta

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src/UniTask/Assets/Plugins/UniTask/Runtime/External/Localization/LocalizationAsyncExtensions.cs

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+#if UNITASK_LOCALIZATION_SUPPORT
+
+using Cysharp.Threading.Tasks.Linq;
+using UnityEngine.Localization;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static partial class LocalizationAsyncExtensions
+    {
+        public static IUniTaskAsyncEnumerable<string> OnValueChangedAsAsyncEnumerable(
+            this LocalizedString localizedString)
+        {
+            return UniTaskAsyncEnumerable.Create<string>(async (writer, cancellationToken) =>
+            {
+                async void Handler(string newValue)
+                {
+                    await writer.YieldAsync(newValue);
+                }
+
+                localizedString.StringChanged += Handler;
+                cancellationToken.Register(() => localizedString.StringChanged -= Handler);
+
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    await UniTask.Yield();
+                }
+            });
+        }
+    }
+}
+
+#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Localization/LocalizationAsyncExtensions.cs.meta

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+timeCreated: 1714073055

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Localization/UniTask.Localization.asmdef

@@ -0,0 +1,24 @@
+{
+    "name": "UniTask.Localization",
+    "rootNamespace": "",
+    "references": [
+        "GUID:f51ebe6a0ceec4240a699833d6309b23",
+        "GUID:eec0964c48f6f4e40bc3ec2257ccf8c5",
+        "GUID:5c01796d064528144a599661eaab93a6"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [
+        {
+            "name": "com.unity.localization",
+            "expression": "",
+            "define": "UNITASK_LOCALIZATION_SUPPORT"
+        }
+    ],
+    "noEngineReferences": false
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Localization/UniTask.Localization.asmdef.meta

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