Add hash method for quantities #759

Job	Run time
Julia min - windows-latest - default	14m 10s
Julia 1 - ubuntu-latest - default	3m 15s
Julia 1 - macos-latest - default	2m 29s
Julia lts - ubuntu-latest - default	3m 14s
Julia lts - windows-latest - default	4m 5s
Julia lts - macos-latest - default	2m 24s
Julia pre - ubuntu-latest - default	3m 24s
Julia 1.8 - macos-latest - default	2m 34s
Julia 1 - windows-latest - default	4m 27s
Julia pre - macos-latest - default	2m 37s
Julia min - ubuntu-latest - default	3m 24s
Julia pre - windows-latest - default	5m 20s
	51m 23s

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