Make ChainedConnector use tuples instead of nesting #2789

Job	Run time
Test	58s
Docs	1m 39s
Test (charset)	59s
build_versions (stable)	21s
cargo-deny (aarch64-apple-ios)	20s
Test (cookies)	1m 1s
build_versions (beta)	21s
cargo-deny (aarch64-linux-android)	22s
Test (socks-proxy)	58s
build_versions (1.71.1)	16s
Lint	40s
cargo-deny (i686-pc-windows-gnu)	18s
Test (gzip)	59s
Test (brotli)	57s
cargo-deny (i686-pc-windows-msvc)	18s
Test	51s
Test (json)	1m 0s
Test (native-tls)	59s
Test (charset)	50s
cargo-deny (i686-unknown-linux-gnu)	18s
Test (cookies)	52s
cargo-deny (wasm32-unknown-unknown)	19s
Test (socks-proxy)	24s
cargo-deny (x86_64-apple-darwin)	19s
Test (gzip)	52s
cargo-deny (x86_64-apple-ios)	18s
Test (brotli)	51s
cargo-deny (x86_64-pc-windows-gnu)	19s
Test (json)	52s
cargo-deny (x86_64-pc-windows-msvc)	21s
Test (native-tls)	52s
cargo-deny (x86_64-unknown-linux-gnu)	19s
Test (rustls-no-provider)	25s
cargo-deny (x86_64-unknown-redox)	20s
	21m 48s

Provide feedback