Fix lifetime management for sycl event

[ZzEeKkAa]

Memory lifetime wasn't set properly which resulted in core dumps of running kernels if boxed sycl event argument where destroyed by GC. New implementation wraps parent into MemInfo object and lifetime of the object is managed by it which is properly managed by numba's compiler.

P.S. : also fixed functions signature for dpctl sycl binding.

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[diptorupd]

LGTM! Thank you for these important changes.