[SYCL][DOC] Add spec and design for "if_device"#8917

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gmlueck wants to merge 6 commits intointel:syclfrom

gmlueck:gmlueck/if-device

Commits on Mar 31, 2023

[SYCL][DOC] Add spec and design for "if_device"
gmlueck
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Commits on Apr 20, 2023

Allow function pointer to "if_host"
gmlueck
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Commits on Apr 21, 2023

Merge branch 'sycl' into gmlueck/if-device
gmlueck
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Commits on Jul 28, 2023

Use perfect forwarding for callable
gmlueck
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Commits on Sep 8, 2023

Use std::forward
gmlueck
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Commits on Sep 11, 2023

Update overview and add example
gmlueck
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