Missing D3D12_MESH_SHADER_PIPELINE_STATE_DESC

Hi,

I noticed that [D3D12_MESH_SHADER_PIPELINE_STATE_DESC](https://learn.microsoft.com/en-us/windows/win32/direct3d12/d3dx12-mesh-shader-pipeline-state-desc) is missing from the metadata, and probably more related to D3D12

IDK if [D3D12_PIPELINE_STATE_STREAM1](https://learn.microsoft.com/en-us/windows/win32/direct3d12/cd3dx12-pipeline-state-stream1) and [D3D12_PIPELINE_STATE_STREAM2](https://learn.microsoft.com/en-us/windows/win32/direct3d12/cd3dx12-pipeline-state-stream2) should also be included

Start by reading the linked Microsoft documentation for D3D12_MESH_SHADER_PIPELINE_STATE_DESC, D3D12_PIPELINE_STATE_STREAM1, and D3D12_PIPELINE_STATE_STREAM2, then inspect how related D3D12 definitions appear in the generated metadata. Done means determining which referenced definitions are missing and adding the appropriate metadata coverage.

Written by the indexing model from the issue text.