Upstream Tracking

[0x676e67]

1. Original Header Cases API hyperium/hyper#2695

• Initial internal support
• Expose in C API (Initial C API for hyper #2278)
• Provide builder options to enable support in Rust, useful to proxies (Decouple preserving header case from FFI (fixes #2313) #2480)
• Design and export the public extension API

2. Instant accounts for system sleep on Windows but not on linux rust-lang/rust#79462
3. Prefixing BoringSSL symbols cloudflare/boring#197
4. Library does not scale with multiple cores hyperium/h2#531
5. Add permessage-deflate support, again snapview/tungstenite-rs#426
6. HTTP/2 CONNECT Upgraded stream bypasses H2 flow-control backpressure, causing unbounded memory growth (OOM) hyperium/hyper#4049
7. Update Hyper Client to support handling expect: 100-continue header hyperium/hyper#3833