WGPU: Create cube textures with one layer per face (#108) #279

Job	Run time
build (windows, x86_64, msvc, Debug)	1m 57s
build (windows, x86_64, msvc, Release)	1m 47s
build (windows, aarch64, msvc, Debug)	2m 15s
build (windows, aarch64, msvc, Release)	2m 30s
build (linux, x86_64, gcc, Debug)	35s
build (linux, x86_64, gcc, Release)	38s
build (linux, x86_64, clang, Debug)	1m 6s
build (linux, x86_64, clang, Release)	1m 16s
build (linux, aarch64, gcc, Debug)	1m 12s
build (linux, aarch64, gcc, Release)	1m 27s
build (linux, aarch64, clang, Debug)	1m 4s
build (linux, aarch64, clang, Release)	1m 26s
build (macos, aarch64, clang, Debug)	59s
build (macos, aarch64, clang, Release)	59s
	19m 11s

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