Add support for swapping out the HTTP Client #1403

Job	Run time
Build (x86_64-pc-windows-msvc)	8m 32s
Build (aarch64-pc-windows-msvc)	8m 30s
Build (x86_64-apple-darwin)	9m 6s
Build (aarch64-apple-darwin)	5m 43s
Build (aarch64-apple-ios)	5m 37s
Build (aarch64-apple-ios-sim)	5m 45s
Build (x86_64-unknown-linux-gnu)	3m 56s
Build (aarch64-unknown-linux-gnu)	6m 0s
Build (aarch64-linux-android)	4m 2s
Build (armv7-linux-androideabi)	3m 39s
Build (x86_64-linux-android)	3m 39s
	1h 4m 29s

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