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Implement support for RGB10A2 vertex formats

Gert Wollny requested to merge gerddie/mesa:implement-r10r10b10a2_vertex_format into msclc-d3d12

The majority of the formats described in ARB_vertex_type_2_10_10_10_rev are not supported directly in DirectX but they are a requirement for OpenGL 3.3. In the cases when such a format is specified as vertex element format, replace the format name by R32_UINT, and lower the decoding of the RGBA components in the vertex shader. This makes the piglit arb_vertex_type_2_10_10_10_rev-array_types.exe pass and also enables correct rendering with the simple renderer in Blender 2.83 (tested with the Char Demo).

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