FIX-#416: Modify setup.py to enable python and platforms specific builds #842

Job	Run time
lint (flake8)	13s
lint (black)	6s
test-ubuntu (backend ray, python 3.8)	2m 36s
test-ubuntu (backend mpi, python 3.8)	2m 5s
test-ubuntu (backend dask, python 3.8)	2m 16s
test-ubuntu (backend pymp, python 3.8)	1m 50s
test-ubuntu (backend pyseq, python 3.8)	1m 46s
test-ubuntu (backend ray, python 3.9)	2m 1s
test-ubuntu (backend mpi, python 3.9)	2m 11s
test-ubuntu (backend dask, python 3.9)	1m 57s
test-ubuntu (backend pymp, python 3.9)	1m 39s
test-ubuntu (backend pyseq, python 3.9)	2m 4s
test-windows (backend ray, python 3.8)	4m 47s
test-windows (backend mpi, python 3.8)	4m 44s
test-windows (backend dask, python 3.8)	5m 16s
test-windows (backend pymp, python 3.8)	4m 29s
test-windows (backend pyseq, python 3.8)	4m 29s
test-windows (backend ray, python 3.9)	6m 24s
test-windows (backend mpi, python 3.9)	5m 39s
test-windows (backend dask, python 3.9)	5m 57s
test-windows (backend pymp, python 3.9)	4m 58s
test-windows (backend pyseq, python 3.9)	4m 51s
	1h 12m 18s

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