C++: Add some more Windows specific memory copy models

[MathiasVP]

A few more memcpy like things found in the wdm.h header for Windows driver development.

[Copilot]

Pull Request Overview

This PR adds Windows-specific memory copy function models to improve dataflow analysis for Windows driver development. The changes extend support for additional memory copy operations found in the Windows Driver Model (WDM) headers.

• Adds external models for 8 new Windows memory functions (RtlCopy*, RtlMove*, RtlInitUnicodeString)
• Includes comprehensive test coverage with dataflow verification for all new functions
• Updates expected test results to reflect the new models

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
windows.cpp	Adds function declarations and comprehensive tests for new Windows memory copy functions
Windows.model.yml	Defines dataflow models for RtlCopy*, RtlMove*, and RtlInitUnicodeString functions
validatemodels.expected	Updates expected validation results for new model specifications
flow.expected	Updates expected dataflow analysis results with new function models

Comments suppressed due to low confidence (2)

cpp/ql/test/library-tests/dataflow/external-models/windows.cpp:496

• The parameter uses SIZE_T type but it's not defined. Consider using the already defined size_t type for consistency with other functions, or add a typedef for SIZE_T.

  SIZE_T     Length

cpp/ql/test/library-tests/dataflow/external-models/windows.cpp:532

• The NTSTATUS type is used but not defined. Consider adding a typedef for NTSTATUS or using a defined type.

NTSTATUS WdmlibRtlInitUnicodeStringEx(

[geoffw0]

LGTM.