axum v0.8.0-rc.1

Note: there are further relevant changes in axum-core's changelog.

Since v0.8.0-alpha.1:

• breaking: Move Host extractor to axum-extra (#2956)
• breaking: Remove WebSocket::close.
  Users should explicitly send close messages themselves. (#2974)
• breaking: Make serve generic over the listener and IO types (#2941)
• breaking: Remove Serve::tcp_nodelay and WithGracefulShutdown::tcp_nodelay.
  See serve::ListenerExt for an API that let you set arbitrary TCP stream properties. (#2941)
• breaking: Option<Path<T>> and Option<Query<T>> no longer swallow all error conditions,
  instead rejecting the request in many cases; see their documentation for details (#2475)
• fixed: Skip SSE incompatible chars of serde_json::RawValue in Event::json_data (#2992)
• fixed: Don't panic when array type is used for path segment (#3039)
• fixed: Avoid setting content-length before middleware.
  This allows middleware to add bodies to requests without needing to manually set content-length (#2897)
• added: Add method_not_allowed_fallback to set a fallback when a path matches but there is no handler for the given HTTP method (#2903)
• added: Add NoContent as a self-described shortcut for StatusCode::NO_CONTENT (#2978)
• added: Add support for WebSockets over HTTP/2.
  They can be enabled by changing get(ws_endpoint) handlers to any(ws_endpoint) (#2894)
• added: Add MethodFilter::CONNECT, routing::connect[_service]
  and MethodRouter::connect[_service] (#2961)
• added: Extend FailedToDeserializePathParams::kind enum with (ErrorKind::DeserializeError)
  This new variant captures both key, value, and message from named path parameters parse errors,
  instead of only deserialization error message in ErrorKind::Message. (#2720)