feat(net): incoming stream

[Berrysoft]

No description provided.

[Copilot]

Pull request overview

Adds an “incoming connection stream” API to compio-net listeners so callers can iterate over accepted connections as a futures_util::Stream, with per-connection SocketOpts support.

Changes:

• Add TcpListener::incoming* and UnixListener::incoming* returning Streams of accepted connections.
• Implement an internal Socket::incoming() stream (Incoming) with platform-specific accept logic (AcceptMulti on Unix, state machine on Windows).
• Add a TCP-focused integration test and promote futures-util to a normal dependency.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
compio-net/tests/incoming.rs	New integration test for TcpListener::incoming()
compio-net/src/unix.rs	Add UnixListener::incoming* + UnixIncoming stream wrapper applying SocketOpts
compio-net/src/tcp.rs	Add TcpListener::incoming* + TcpIncoming stream wrapper applying SocketOpts
compio-net/src/socket.rs	Add internal Incoming accept stream and Socket::incoming() constructor
compio-net/Cargo.toml	Add futures-util as a non-dev dependency

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[George-Miao]

LGTM