feat(io): read-multi traits

[Berrysoft]

It's a pity that I'm not able to implement AsyncReadMulti for Cursor<File>, because the std Cursor doesn't provide an API to split the mutable ref to the position and the inner stream.

Is it the time to implement a new Cursor type for our usage?

[Copilot]

Pull request overview

This PR introduces two new public traits, AsyncReadMulti and AsyncReadMultiAt, to the compio-io crate. These traits extend the existing AsyncReadManaged and AsyncReadManagedAt traits respectively, adding support for continuous, stream-based reads using a buffer pool — yielding a Stream of managed buffers instead of a single buffer per call.

Changes:

• Adds compio-io/src/read/multi.rs defining the AsyncReadMulti and AsyncReadMultiAt traits
• Wires up the new module in compio-io/src/read/mod.rs with mod multi and pub use multi::*
• Updates the crate-level docs in compio-io/src/lib.rs to list the new traits under "Managed IO"

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
compio-io/src/read/multi.rs	New file defining AsyncReadMulti and AsyncReadMultiAt traits with read_multi and read_multi_at methods returning impl Stream
compio-io/src/read/mod.rs	Adds mod multi submodule and re-exports its contents
compio-io/src/lib.rs	Adds crate-level documentation entries for the two new traits under the "Managed IO" section

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[George-Miao]

Can you draft some example implentation on compio-fs or compio-net in another PR? Just want to grasp what the underlying stream looks like and decide wether this design fits.

[Berrysoft]

OK, I'll draft one later.

[George-Miao]

Blocked by #796.

[George-Miao]

LGTM