fix(driver,unix): add some control API usages

[Berrysoft]

I don't know why they were forgotten last time.

[Copilot]

Pull request overview

This PR updates Unix socket send/recv ops in the polling and io-uring backends to use the shared *MsgControl control structures (holding msghdr + iovecs) so self-referential msghdr state lives in OpCode::Control rather than on the op itself.

Changes:

• Refactors poll-based recvmsg/sendmsg vectored ops to build and use SendMsgControl during init, and captures msg_namelen into the op result state.
• Refactors io-uring RecvFrom*/SendTo* ops to create RecvMsgControl/SendMsgControl controls up-front and plumb them into create_entry, with name_len tracked on completion.
• Refactors io-uring managed RecvFromManaged to move msghdr/iovec into a dedicated control type.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
compio-driver/src/sys/poll/op.rs	Switches poll-based vectored send/recv-from ops to use SendMsgControl control state.
compio-driver/src/sys/iour/op/mod.rs	Switches io-uring send-to/recv-from ops to build *MsgControl in init and use it in create_entry.
compio-driver/src/sys/iour/op/managed.rs	Moves RecvFromManaged’s msghdr/iovec into Control to support control API usage with buffer selection.

Comments suppressed due to low confidence (1)

compio-driver/src/sys/iour/op/managed.rs:233

• RecvFromManaged::new no longer validates the requested len (previously rejected values that don’t fit expected limits). Other managed ops in this module still return InvalidInput when len is too large (e.g. RecvManaged). Consider restoring a bounds check (at least rejecting values that don’t fit the underlying io-uring / buffer-pool constraints) to keep API behavior consistent and avoid kernel EINVALs for oversized iov lengths.

impl<S> RecvFromManaged<S> {
    /// Create [`RecvFromManaged`].
    pub fn new(fd: S, buffer_pool: &BufferPool, len: usize, flags: i32) -> io::Result<Self> {
        let addr = SockAddrStorage::zeroed();
        Ok(Self {
            fd,
            buffer_group: buffer_pool.buffer_group()?,
            flags,
            name_len: 0,
            buffer_len: len,
            addr,
            buffer_pool: buffer_pool.clone(),
            buffer: None,
        })
    }

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[George-Miao]

LGTM