FIX-#428: Add missing files in source dist on PyPI (#429) #866

Job	Run time
lint (flake8)	9s
lint (black)	7s
test-ubuntu (backend ray, python 3.9)	2m 4s
test-ubuntu (backend mpi, python 3.9)	2m 6s
test-ubuntu (backend dask, python 3.9)	2m 6s
test-ubuntu (backend pymp, python 3.9)	1m 54s
test-ubuntu (backend pyseq, python 3.9)	1m 59s
test-ubuntu (backend ray, python 3.10)	2m 2s
test-ubuntu (backend mpi, python 3.10)	2m 12s
test-ubuntu (backend dask, python 3.10)	2m 12s
test-ubuntu (backend pymp, python 3.10)	1m 40s
test-ubuntu (backend pyseq, python 3.10)	1m 52s
test-windows (backend ray, python 3.9)	5m 9s
test-windows (backend mpi, python 3.9)	5m 23s
test-windows (backend dask, python 3.9)	5m 5s
test-windows (backend pymp, python 3.9)	4m 44s
test-windows (backend pyseq, python 3.9)	4m 57s
test-windows (backend ray, python 3.10)	5m 2s
test-windows (backend mpi, python 3.10)	5m 46s
test-windows (backend dask, python 3.10)	5m 25s
test-windows (backend pymp, python 3.10)	5m 22s
test-windows (backend pyseq, python 3.10)	5m 22s
	1h 12m 38s

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