Support round-robin parallelization for commutative commands

[festutz]

Signed-off-by: Felix Stutz fstutz@mpi-sws.org

[github-actions]

OS:ubuntu-20.04
Thu Jun 30 18:33:29 UTC 2022
intro: 0/2 tests passed.
interface: 6/38 tests passed.
compiler: 0/54 tests passed.
agg: 10/109 tests passed.
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