Use oneapi::dpl::sort_by_key if possible

[masterleinad]

Fixes #926. I didn't see much of a difference in performance but that also wasn't really expected at this point.

[aprokop]

Should we just require this? What's the minimum version for Kokkos? Do we care?

[masterleinad]

Kokkos doesn't have a minimum version; as of now, we are only using dpl::sort anyway.
oneDPL is not necessarily recent enough on the testbeds so I wouldn't want to require 2022.2 at this point.

[aprokop]

@masterleinad please confirm that you verified that the code executes the sort by key with the new onedpl. In other words, that the macro check is correct.

[masterleinad]

@masterleinad please confirm that you verified that the code executes the sort by key with the new onedpl. In other words, that the macro check is correct.

I tested without the macro guards before on the testbeds (with newer than default compiler versions, i.e., an oneDPL commit that includes sort_by_key based on 2022.1.1), and that worked fine.

[masterleinad]

I also tested manually with the 2022.2.0 oneDPL release which works fine. However, we get a bunch more warnings and it's not clear to me if it's beneficial to update the CI (here or in a follow-up pull request).

[aprokop]

LGTM