Move ILinksExtensions to Platform::Data namespace and update with CLinks concept

[konard]

🚀 Solution Summary

This PR implements the requirements from issue #84 by:

✅ Completed Tasks

• Change namespace: ILinksExtensions is already in Platform::Data namespace
• Move extensions from ILinks: Extensions were already moved from ILinks.h to ILinksExtensions.h
• Make functions accept CLinks concept: Updated all extension functions to use CLinks concept constraint

📋 Implementation Details

1. CLinks Concept (cpp/Platform.Data/CLinks.h)

• Created a C++20 concept that defines the requirements for link storage types
• Requires types to have necessary type aliases: LinkAddressType, LinksOptionsType, LinkType, ReadHandlerType, WriteHandlerType
• Requires core methods: Count, Each, Create, Update, Delete
• Requires Constants static member

2. Updated ILinksExtensions (cpp/Platform.Data/ILinksExtensions.h)

• Changed all template parameters from typename TStorage to CLinks TStorage
• Added necessary includes: CLinks.h, LinksConstantsExtensions.h, Point.h
• Fixed inconsistent function calls to IsExternalReference and IsInternalReference
• Added macro definitions for DIRECT_METHOD_CALL and Ensures

3. Function Updates

All extension functions now properly constrain their first parameter:

• Create (both overloads)
• Update
• Delete (both overloads)
• Count
• Exists
• Each
• GetLink
• IsFullPoint
• IsPartialPoint

🧪 Testing

• Existing tests in ILinksTests.cpp confirm the extension functions work correctly
• The implementation maintains backward compatibility with existing code
• Functions can be called directly (e.g., Create(storage, linkAddress)) as shown in tests

🔗 Issue Reference

Fixes #84

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