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Closes #1267

This is useful for building hierarchical depth bounds, as one example.

Hardware support:

• Vulkan: VK_EXT_sampler_filter_minmax is present on around 50% desktops and 25% Android devices. There is a set of formats supporting min/max sampling, enabled by filterMinmaxSingleComponentFormats property. It's hard to grasp the support surface for the others.
• D3D12: apparently gated by TILED_RESOURCES_TIER_2, but I don't know how to find the stats on how widely it's supported, and whether or not all the formats support it (@RafaelCintron ?)
• D3D11: MinMaxFiltering flag, nice documentation in https://docs.microsoft.com/en-us/windows/win32/direct3d11/tiled-resources-texture-sampling-features
• Metal: not seeing anything for this

Note: min/max sampling shouldn't be considered "filtering" for the purpose of validation.

TODO:

• figure out which formats support this, potentially add a column to our format table.
• determine if it's a filter mode, or something entirely different. Can a sampler be linearly magnifying but minmaxing the minification? In D3D12 it can, it seems, but maybe we don't need that.
• determine if a separate sampler binding type is needed

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