Audit D3D12 Features and Limits wrt Resource Binding Tiers

[cwfitzgerald]

We should go through the limits and feature code for d3d12 - specifically looking at the implications of resource binding tiers, partial binding, etc

https://learn.microsoft.com/en-us/windows/win32/direct3d12/hardware-support

• We can assume FL11_1 for WebGPU purposes. So this can be set to 64 / 2 shader stages / 2 types of UAVs = 16 minimum for both max_storage_textures_per_shader_stage and max_storage_buffers_per_shader_stage