DDSTextureLoader needs support for depth/stencil

Currently DDS files for the following fail because they are planar on DX12, but were linear on DX11 so the DDS contains linear data. This issue is to add logic to the loader to handle this conversion.

```
DXGI_FORMAT_D32_FLOAT_S8X24_UINT
DXGI_FORMAT_D24_UNORM_S8_UINT
``` 