Packaging and github actions updates #341

Job	Run time
Build MDANSE and run tests on ubuntu-20.04	1m 51s
Build MDANSE and run tests on ubuntu-20.04	1m 39s
Build MDANSE and run tests on ubuntu-20.04	1m 38s
Build MDANSE and run tests on ubuntu-20.04	1m 46s
Build MDANSE and run tests on windows-2019	2m 16s
Build MDANSE and run tests on windows-2019	3m 12s
Build MDANSE and run tests on windows-2019	1m 47s
Build MDANSE and run tests on windows-2019	2m 14s
Build MDANSE and run tests on macOS-11	2m 26s
Build MDANSE and run tests on macOS-11	2m 28s
Build MDANSE and run tests on macOS-11	3m 24s
Build MDANSE and run tests on macOS-11	3m 46s
	28m 27s

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