Add support for swapping out the HTTP Client #1405

Job	Run time
Build (x86_64-pc-windows-msvc)	7m 30s
Build (aarch64-pc-windows-msvc)	8m 33s
Build (x86_64-apple-darwin)	7m 3s
Build (aarch64-apple-darwin)	7m 1s
Build (aarch64-apple-ios)	5m 16s
Build (aarch64-apple-ios-sim)	6m 39s
Build (x86_64-unknown-linux-gnu)	4m 9s
Build (aarch64-unknown-linux-gnu)	5m 37s
Build (aarch64-linux-android)	3m 44s
Build (armv7-linux-androideabi)	3m 42s
Build (x86_64-linux-android)	3m 34s
	1h 2m 48s

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