Implement Happy Eyeballs connection RFC #1816

Job	Run time
Lint	27s
Docs	19s
build_versions (stable)	18s
build_versions (beta)	39s
Test	39s
build_versions (1.61.0)	29s
Test (json)	45s
cargo-deny (aarch64-apple-ios)	19s
Test (charset)	49s
cargo-deny (aarch64-linux-android)	17s
Test (cookies)	43s
cargo-deny (i686-pc-windows-gnu)	18s
cargo-deny (i686-pc-windows-msvc)	31s
Test (socks-proxy)	16s
cargo-deny (i686-unknown-linux-gnu)	20s
Test (native-certs)	43s
cargo-deny (wasm32-unknown-unknown)	18s
Test (gzip)	37s
cargo-deny (x86_64-apple-darwin)	17s
Test (brotli)	43s
cargo-deny (x86_64-apple-ios)	29s
Test (http-crate)	43s
cargo-deny (x86_64-pc-windows-gnu)	21s
cargo-deny (x86_64-pc-windows-msvc)	18s
Test (http-interop)	37s
cargo-deny (x86_64-unknown-linux-gnu)	21s
Test (http-crate http-interop)	40s
cargo-deny (x86_64-unknown-redox)	26s
Test (tls)	32s
Test (tls, json)	8s
Test (tls, charset)	15s
Test (tls, cookies)	16s
Test (tls, socks-proxy)	6s
Test (tls, native-certs)	8s
Test (tls, gzip)	15s
Test (tls, brotli)	18s
Test (tls, http-crate)	8s
Test (tls, http-interop)	9s
Test (tls, http-crate http-interop)	12s
Test (native-tls)	56s
Test (native-tls, json)	47s
Test (native-tls, charset)	40s
Test (native-tls, cookies)	42s
Test (native-tls, socks-proxy)	32s
Test (native-tls, native-certs)	33s
Test (native-tls, gzip)	44s
Test (native-tls, brotli)	43s
Test (native-tls, http-crate)	45s
Test (native-tls, http-interop)	44s
Test (native-tls, http-crate http-interop)	49s
	24m 4s

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