Rename C++ ThrowExtensions to ExceptionFactory to reflect actual behavior

[konard]

Summary

• Renamed ThrowExtensions.h to ExceptionFactory.h in the C++ implementation
• Updated all references including include statements and Visual Studio project files
• The C++ functions return exception objects rather than throwing them, making "ExceptionFactory" a more accurate name

Background

The issue was that the C++ ThrowExtensions.h file contains functions that return exception objects (like std::logic_error) rather than throwing them, making the name misleading:

// These are factory functions that return exceptions, not throw them
auto NotSupportedException() { return std::logic_error("Not supported exception."); }
auto NotImplementedException() { return std::logic_error("Not implemented exception."); }

These are used with throw by calling code:

throw Platform::Exceptions::NotSupportedException();

The C# version correctly uses the name ThrowExtensions because those methods actually do throw exceptions.

Changes Made

• Renamed cpp/Platform.Exceptions/ThrowExtensions.h → cpp/Platform.Exceptions/ExceptionFactory.h
• Updated include in Platform.Exceptions.h
• Updated Visual Studio project files (.vcxproj and .vcxproj.filters)

Test Plan

• Verify all references updated correctly
• Ensure C# ThrowExtensions remain unchanged (they correctly throw exceptions)
• CI will verify compilation works correctly

Fixes #76

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