Add support for swapping out the HTTP Client #1404

Job	Run time
Build (x86_64-pc-windows-msvc)	9m 50s
Build (aarch64-pc-windows-msvc)	10m 6s
Build (x86_64-apple-darwin)	9m 3s
Build (aarch64-apple-darwin)	8m 13s
Build (aarch64-apple-ios)	8m 17s
Build (aarch64-apple-ios-sim)	7m 9s
Build (x86_64-unknown-linux-gnu)	4m 10s
Build (aarch64-unknown-linux-gnu)	5m 54s
Build (aarch64-linux-android)	3m 48s
Build (armv7-linux-androideabi)	3m 37s
Build (x86_64-linux-android)	3m 37s
	1h 13m 44s

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