Depending on the actual platform, Blender will disable features that are
known to have a faulty implementation. Add-on developers or users don't
have the ability to check what is actually enabled.
This patch will add the ability to check for
* Compute shader support `gpu.capabilities.compute_shader_support_get()`.
* SSBO support `gpu.capabilities.shader_storage_buffer_objects_support_get()`.
* Image load/store `gpu.capabilities.shader_image_load_store_support_get()`.
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