PaRSEC: added new package (#20170)
PaRSEC: added new package (#20170)

PaRSEC: the Parallel Runtime Scheduler and Execution Controller for micro-tasks on distributed heterogeneous systems.

Signed-off-by: Aurelien Bouteiller <ac358fa4b02ae043c59dde79b280be5ec22b99f9@icl.utk.edu>
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack