http_interop: Implement `Request` conversion for `http::request::Parts` #1690

Job	Run time
Docs	47s
Lint	32s
cargo-deny (aarch64-apple-ios)	26s
cargo-deny (aarch64-linux-android)	24s
cargo-deny (i686-pc-windows-gnu)	29s
cargo-deny (i686-pc-windows-msvc)	32s
Test	1m 12s
cargo-deny (i686-unknown-linux-gnu)	28s
Test (json)	1m 10s
cargo-deny (wasm32-unknown-unknown)	27s
Test (charset)	1m 13s
cargo-deny (x86_64-apple-darwin)	26s
Test (cookies)	1m 15s
cargo-deny (x86_64-apple-ios)	24s
Test (socks-proxy)	1m 12s
cargo-deny (x86_64-pc-windows-gnu)	28s
Test (native-certs)	1m 5s
cargo-deny (x86_64-pc-windows-msvc)	29s
Test (gzip)	1m 14s
cargo-deny (x86_64-unknown-linux-gnu)	27s
Test (brotli)	1m 8s
cargo-deny (x86_64-unknown-redox)	30s
Test (http-interop)	1m 9s
Test (tls)	1m 11s
Test (tls, json)	1s
Test (tls, charset)	1s
Test (tls, cookies)	1s
Test (tls, socks-proxy)	1s
Test (tls, native-certs)	1s
Test (tls, gzip)	1s
Test (tls, brotli)	1m 15s
Test (tls, http-interop)	1s
Test (native-tls)	1m 14s
Test (native-tls, json)	1m 13s
Test (native-tls, charset)	1m 13s
Test (native-tls, cookies)	1m 15s
Test (native-tls, socks-proxy)	1m 13s
Test (native-tls, native-certs)	1m 14s
Test (native-tls, gzip)	1m 13s
Test (native-tls, brotli)	1m 13s
Test (native-tls, http-interop)	1m 14s
	31m 2s

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