Make Duration::not_zero public. #2784

Job	Run time
build_versions (stable)	18s
Test	44s
build_versions (beta)	15s
Test (charset)	42s
Docs	1m 49s
build_versions (1.71.1)	16s
cargo-deny (aarch64-apple-ios)	18s
Test (cookies)	45s
cargo-deny (aarch64-linux-android)	19s
Test (socks-proxy)	43s
Lint	39s
cargo-deny (i686-pc-windows-gnu)	22s
Test (gzip)	42s
cargo-deny (i686-pc-windows-msvc)	22s
Test (brotli)	46s
cargo-deny (i686-unknown-linux-gnu)	26s
Test (json)	42s
Test	27s
cargo-deny (wasm32-unknown-unknown)	22s
Test (native-tls)	45s
Test (charset)	40s
cargo-deny (x86_64-apple-darwin)	22s
Test (cookies)	40s
cargo-deny (x86_64-apple-ios)	23s
cargo-deny (x86_64-pc-windows-gnu)	21s
cargo-deny (x86_64-pc-windows-msvc)	18s
Test (socks-proxy)	22s
cargo-deny (x86_64-unknown-linux-gnu)	17s
Test (gzip)	36s
cargo-deny (x86_64-unknown-redox)	19s
Test (brotli)	42s
Test (json)	23s
Test (native-tls)	24s
Test (rustls-no-provider)	22s
	17m 51s

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