Make ChainedConnector use tuples instead of nesting #2806

Job	Run time
build_versions (stable)	16s
cargo-deny (aarch64-apple-ios)	18s
build_versions (beta)	15s
Test	43s
cargo-deny (aarch64-linux-android)	22s
Test	35s
build_versions (1.71.1)	15s
Test (charset)	44s
cargo-deny (i686-pc-windows-gnu)	19s
Test (charset)	36s
Test (cookies)	45s
cargo-deny (i686-pc-windows-msvc)	19s
Test (cookies)	37s
Test (socks-proxy)	42s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (socks-proxy)	36s
Docs	1m 49s
Test (gzip)	41s
Test (gzip)	38s
cargo-deny (wasm32-unknown-unknown)	18s
Test (brotli)	46s
Test (brotli)	36s
Lint	35s
Test (json)	39s
Test (json)	43s
Test (native-tls)	38s
Test (native-tls)	45s
Test (rustls-no-provider)	37s
cargo-deny (x86_64-apple-darwin)	18s
cargo-deny (x86_64-apple-ios)	20s
cargo-deny (x86_64-pc-windows-gnu)	18s
cargo-deny (x86_64-pc-windows-msvc)	17s
cargo-deny (x86_64-unknown-linux-gnu)	18s
cargo-deny (x86_64-unknown-redox)	17s
	18m 14s

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