Add support for streaming ZIP packages over HTTP #878

Job	Run time
Integration (Swift Package Manager)	1m 7s
Integration (Swift Package Manager)	2m 6s
Build	49s
Build	3m 28s
Lint	1m 22s
Lint	1m 22s
Integration (Local)	1m 9s
Integration (Local)	2m 33s
Integration (Carthage)	3m 10s
Integration (Carthage)	12m 23s
	29m 29s

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