Remove need to specify image formats for ray tracing storage images

[SaschaWillems]

Description

This is an alternative fox for #1443. Instead of adjusting image formats in the C++ side of the code, this uses widely supported features to remove the need to specify format qualifiers at all.

Works with glsl, slang and hlsl.

Fixes #1423

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[asuessenbach]

I would prefer the approach from #1443.

Besides that: Approved.

[SaschaWillems]

Indeed. It feels odd that the correct way is more verbose. Something that might be worth fixing with future Vulkan versions. I've raised in internal issue.

[gary-sweet]

shaderStorageImageWriteWithoutFormat is only supported by more recent hardware for us, but since we don't support ray tracing, it doesn't actually matter.

[gary-sweet]

Sorry, I shouldn't actually approve this since I can't test it