build

Add a 2D MPL_ALLREDUCE interface #90

Job	Run time
ci (Release, linux gnu-10)	8m 19s
ci (Release, linux gnu-10)	8m 19s
ci (Release, linux clang-12)	9m 18s
ci (Release, linux clang-12)	9m 18s
ci (Release, linux nvhpc-21.9)	6m 21s
ci (Release, linux nvhpc-21.9)	6m 21s
ci (Release, linux intel-classic)	5m 11s
ci (Release, linux intel-classic)	5m 11s
ci (Release, macos)	28m 4s
ci (Release, macos)	28m 4s
ci (Debug, linux gnu-10)	8m 35s
ci (Debug, linux gnu-10)	8m 35s
ci (Debug, linux clang-12)	8m 48s
ci (Debug, linux clang-12)	8m 48s
ci (Debug, linux nvhpc-21.9)	5m 10s
ci (Debug, linux nvhpc-21.9)	5m 10s
ci (Debug, linux intel-classic)	5m 8s
ci (Debug, linux intel-classic)	5m 8s
ci (Debug, macos)	21m 57s
ci (Debug, macos)	27m 31s
	3h 39m 16s

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