[OSX] HybridGlobalization implement compare native function

docs/design/features/hybrid-globalization.md

@@ -245,3 +245,65 @@ Using `IgnoreNonSpace` for these two with `HybridGlobalization` off, also return
 ``` C#
 new CultureInfo("de-DE").CompareInfo.IndexOf("strasse", "stra\u00DFe", 0, CompareOptions.IgnoreNonSpace); // 0 or -1
 ```
+
+
+### OSX
+
+For OSX platforms we are using native apis instead of ICU data.
+
+**String comparison**
+
+Affected public APIs:
+- CompareInfo.Compare,
+- String.Compare,
+- String.Equals.
+
+The number of `CompareOptions` and `NSStringCompareOptions` combinations are limited. Originally supported combinations can be found [here for CompareOptions](https://learn.microsoft.com/dotnet/api/system.globalization.compareoptions) and [here for NSStringCompareOptions](https://developer.apple.com/documentation/foundation/nsstringcompareoptions).
+
+- `IgnoreSymbols` is not supported because there is no equivalent in native api. Throws `PlatformNotSupportedException`.
+
+- `IgnoreKanaType` is not supported because there is no equivalent in native api. Throws `PlatformNotSupportedException`.
+
+- `None`:
+
+`CompareOptions.None` is mapped to `NSStringCompareOptions.NSLiteralSearch`
+
+There are some behaviour changes. Below are examples of such cases.
+
+| **character 1** | **character 2** | **CompareOptions** | **hybrid globalization** | **icu** |                       **comments**                      |
+|:---------------:|:---------------:|--------------------|:------------------------:|:-------:|:-------------------------------------------------------:|
+|   `\u3042` あ   |   `\u30A1` ァ   |   None  |             1            |    -1   |     hiragana and katakana characters are ordered differently compared to ICU    |
+|   `\u304D\u3083` きゃ  |   `\u30AD\u30E3` キャ |     None     |             1            |    -1   | hiragana and katakana characters are ordered differently compared to ICU  |
+|   `\u304D\u3083` きゃ  |   `\u30AD\u3083` キゃ  |     None     |             1           |    -1   |  hiragana and katakana characters are ordered differently compared to ICU  |
+|   `\u3070\u3073\uFF8C\uFF9E\uFF8D\uFF9E\u307C` ばびﾌﾞﾍﾞぼ  |   `\u30D0\u30D3\u3076\u30D9\uFF8E\uFF9E` バビぶベﾎﾞ  |     None     |   1  |  -1  | hiragana and katakana characters are ordered differently compared to ICU   |
+|   `\u3060` だ  |   `\u30C0` ダ  |     None     |   1  |  -1  |   hiragana and katakana characters are ordered differently compared to ICU |
+|   `\u00C0` À  |   `A\u0300` À  |     None     |   1  |  0  |   This is not same character for native api |
+
+- `StringSort` :
+
+`CompareOptions.StringSort` is mapped to `NSStringCompareOptions.NSLiteralSearch` .ICU's default is to use "StringSort", i.e. nonalphanumeric symbols come before alphanumeric. That is how works also `NSLiteralSearch`.
+
+- `IgnoreCase`:
+
+`CompareOptions.IgnoreCase` is mapped to `NSStringCompareOptions.NSCaseInsensitiveSearch | NSStringCompareOptions.NSLiteralSearch`
+
+There are some behaviour changes. Below are examples of such cases.
+
+| **character 1** | **character 2** | **CompareOptions** | **hybrid globalization** | **icu** |                       **comments**                      |
+|:---------------:|:---------------:|--------------------|:------------------------:|:-------:|:-------------------------------------------------------:|
+|   `\u3060` だ |   `\u30C0` ダ  |     IgnoreCase     |   1  |  -1  |  hiragana and katakana characters are ordered differently compared to ICU  |
+|   `\u00C0` À |   `a\u0300` à  |     IgnoreCase     |   1  |  0  |  This is related to above mentioned case under `CompareOptions.None` i.e. `\u00C0` À !=  À `A\u0300`   |
+
+- `IgnoreNonSpace`:
+
+`CompareOptions.IgnoreNonSpace` is mapped to `NSStringCompareOptions.NSDiacriticInsensitiveSearch | NSStringCompareOptions.NSLiteralSearch`
+
+- `IgnoreWidth`:
+
+`CompareOptions.IgnoreWidth` is mapped to `NSStringCompareOptions.NSWidthInsensitiveSearch | NSStringCompareOptions.NSLiteralSearch`
+
+- All combinations that contain below `CompareOptions` always throw `PlatformNotSupportedException`:
+
+`IgnoreSymbols`,
+
+`IgnoreKanaType`,

src/libraries/Common/src/Interop/Interop.Collation.OSX.cs

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Globalization;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class Globalization
+    {
+        [LibraryImport(Libraries.GlobalizationNative, EntryPoint = "GlobalizationNative_CompareStringNative", StringMarshalling = StringMarshalling.Utf16)]
+        internal static unsafe partial int CompareStringNative(string localeName, int lNameLen, char* lpStr1, int cwStr1Len, char* lpStr2, int cwStr2Len, CompareOptions options);
+    }
+}

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs

@@ -356,6 +356,7 @@ public static string GetDistroVersionString()
 
         public static bool IsInvariantGlobalization => m_isInvariant.Value;
         public static bool IsHybridGlobalizationOnBrowser => m_isHybrid.Value && IsBrowser;
+        public static bool IsHybridGlobalizationOnOSX => m_isHybrid.Value && (IsOSX || IsMacCatalyst || IsiOS || IstvOS);
         public static bool IsNotHybridGlobalizationOnBrowser => !IsHybridGlobalizationOnBrowser;
         public static bool IsNotInvariantGlobalization => !IsInvariantGlobalization;
         public static bool IsIcuGlobalization => ICUVersion > new Version(0, 0, 0, 0);