Introduce `HTTPExt` package extension #316

Job	Run time
Julia 1 - macOS-13 x64	2m 37s
Julia 1 - macOS-latest aarch64	1m 51s
Julia 1 - ubuntu-latest x64	1m 46s
Julia 1 - windows-latest x64	4m 21s
Julia lts - macOS-13 x64	3m 48s
Julia lts - macOS-latest aarch64	1m 44s
Julia lts - ubuntu-latest x64	2m 20s
Julia lts - windows-latest x64	3m 23s
Julia 1.6 - macOS-13 x64	3m 9s
Julia 1.6 - ubuntu-latest x64	2m 13s
Julia 1.6 - windows-latest x64	9m 51s
Julia 1 - ubuntu-latest x86	1m 57s
Julia nightly - ubuntu-latest x64	2m 8s
	41m 8s

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