Use DIRECT_METHOD_CALL equivalent in C# ILinksExtensions

[konard]

Summary

This PR implements the C# equivalent of the C++ DIRECT_METHOD_CALL macro in the ILinksExtensions class to enable performance optimizations similar to those available in the C++ version.

🎯 Fixes Issue

Fixes #125 - Use DIRECT_METHOD_CALL in ILinks extensions

🔧 Implementation Details

Added DirectMethodCall Helper Method

• Created a private DirectMethodCall<TLinkAddress, TConstants, TResult> helper method
• Marked with [MethodImpl(MethodImplOptions.AggressiveInlining)] for JIT optimization
• Allows the JIT compiler to potentially devirtualize method calls when concrete types are known

Updated Method Calls

The following methods now use DirectMethodCall for performance optimization:

• Create methods: Both overloads now use DirectMethodCall for links.Create() calls
• Update method: Uses DirectMethodCall for links.Update() calls
• Delete method: Uses DirectMethodCall for links.Delete() calls
• Exists method: Uses DirectMethodCall for links.Count() calls
• Each method: Uses DirectMethodCall for links.Each() calls
• GetLink method: Uses DirectMethodCall for internal links.Each() calls

🚀 Performance Benefits

In C++, DIRECT_METHOD_CALL macro conditionally calls methods directly on concrete types vs through virtual dispatch:

#define DIRECT_METHOD_CALL(TClass, Object, MethodName, ...) \
  (std::is_abstract<TClass>::value ? Object.MethodName(__VA_ARGS__) : Object.TClass::MethodName(__VA_ARGS__))

In C#, the DirectMethodCall helper enables similar optimizations by:

• Providing a consistent pattern for method invocation
• Allowing the JIT compiler to optimize calls when concrete types are known at compile time
• Maintaining the same semantic behavior as direct calls

✅ Testing

• ✅ All existing tests pass
• ✅ Build succeeds without errors
• ✅ No breaking changes to public API

📝 Code Quality

• Maintains existing code style and conventions
• Preserves all XML documentation
• Uses consistent naming patterns
• Follows the established architectural patterns

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