[SYCL][Doc] Add draft forward progress extension (#7598)

This extension strengthens the forward progress guarantees provided by a
SYCL implementation, and exposes the guarantees of particular
implementations/backends/devices via new device queries and kernel
properties.

Signed-off-by: John Pennycook <[email protected]>

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Signed-off-by: John Pennycook <[email protected]>
Co-authored-by: Greg Lueck <[email protected]>
Co-authored-by: Ben Ashbaugh <[email protected]>

Author: 3 people