CP030 Item view extension

[steffenlarsen]

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Adds an extension for a new item_view SYCL object. The item_view allows for expressing a uniform access pattern to device memory, exposing each item in the underlying data as an additional parameter to the kernel function. This feature extends the functionality of variadic parallel_for allowing item_view objects to be intermingled with reduction objects.

[keryell]

Interesting ideas.