adding FB Fetch macros and PLATFORM_SUPPORTS_NATIVE_RENDERPASS #4307
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Purpose of this PR
This PR introduces fb fetch macros that will be needed for implementing input attachments for URP RenderPass work. However, it's more of a core lib thing, so adding it to core package. The macros itself are salvaged from previous Renderpass work PR (#396) with an addition of DXC compiler branches, that was recently introduced
Testing status
Manually hacked the shaders to check if it works. But most proper testing will be done with input attachment PR
Comments to reviewers
Notes for the reviewers you have assigned.