Cache textures on wgpu (#62) #4

Job	Run time
Build WebGL Example (ubuntu-latest)	1m 27s
Build [OpenGL \| Linux (x86)]	2m 0s
Build [OpenGL \| Linux (ARM)]	3m 10s
Build [OpenGL \| MacOS (x86)]	2m 23s
Build [OpenGL \| MacOS (ARM)]	2m 55s
Build [OpenGL \| Windows (x86)]	2m 53s
Build [WGPU \| Linux (x86)]	3m 26s
Build [WGPU \| Linux (ARM)]	3m 52s
Build [WGPU \| MacOS (x86)]	5m 4s
Build [WGPU \| MacOS (ARM)]	4m 13s
Build [WGPU \| Windows (x86)]	6m 12s
	37m 35s

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