[iOS][globalization] Implementing Unicode version retrieval (`CompareInfo.Version`) on iOS

[matouskozak]

runtime/src/libraries/System.Private.CoreLib/src/System/Globalization/CompareInfo.cs

Lines 1599 to 1604 in b61c8fc

	#if TARGET_MACCATALYST || TARGET_IOS || TARGET_TVOS
	if (GlobalizationMode.Hybrid)
	{
	throw new PlatformNotSupportedException(GetPNSEText("SortVersion"));
	}
	#endif

CompareInfo.Version currently throws an exception on iOS-like platforms. We need to have a workaround to return Unicode version used for string comparisons by Apple APIs instead of throwing an exception.

• Investigate how to get version of the SortKey retrieved by

  runtime/src/native/libs/System.Globalization.Native/pal_collation.m

  Line 329 in 8be351c

  int32_t GlobalizationNative_GetSortKeyNative(const uint16_t* localeName, int32_t lNameLength, const UChar* lpStr, int32_t cwStrLength,

• Should have similar characteristics as ucol_getVersion

  runtime/src/native/libs/System.Globalization.Native/pal_collation.c

  Line 898 in 45bd118

  ucol_getVersion(pColl, (uint8_t *) &result);

• Add tests cases https://github.com/dotnet/runtime/blob/main/src/libraries/System.Runtime/tests/System.Globalization.Tests/CompareInfo/CompareInfoTests.SortKey.cs

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