feat: create `mpiflags` option #2072

Job	Run time
conda_test (3.12, ubuntu-latest)	9m 15s
test (1, 3.12, ubuntu-latest, main)	15m 51s
dev_install (ubuntu-latest, 3.12, 1)	5m 1s
test (1.6, 3.8, ubuntu-latest, include)	16m 35s
dev_install (ubuntu-latest, 3.8, 1.6)	6m 13s
test (1, 3.12, ubuntu-latest, include)	10m 34s
Check types (3.12, ubuntu-latest)	2m 47s
Check types (3.8, ubuntu-latest)	35s
Indicate completion to coveralls.io	10s
	1h 7m 1s

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