KTX2Loader: Add support for VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT #29441
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Partial Basis Universal HDR UASTC (half float) support. On devices with ASTC support, no transcoding is required, and we can upload the texture data directly. Continued from #29418.
Next PR will be for devices without ASTC support, where we'll need to transcode to BC6H or decode to F16.