Move std::io tests to alloctests & add prelude

[bushrat011899]

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ACP: rust-lang/libs-team#755
Tracking issue: #154046
Blocked on: #158548

Description

• Moves tests out of std::io into alloctests now that the relevant items are fully available from alloc::io.
• Adds documentation to alloc::io
• Adds prelude modules to core::io and alloc::io.

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Notes

• No AI tooling of any kind was used during the creation of this PR.

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[bushrat011899]

@rustbot ready

This PR has been split apart to the point where all it does is move tests, add documentation, and setup core::io::prelude and alloc::io::prelude. I'm happy to split further if desirable, but I think it's fine? @clarfonthey tagging you as well just in case you're interested!

[bushrat011899]

@rustbot label -T-rustdoc-frontend

Outdated label

[clarfonthey]

r? clarfonthey

[clarfonthey]

All looks reasonable to me! Just moving stuff around.

@bors r+

[rust-bors]

📌 Commit 5b49a9d has been approved by clarfonthey

It is now in the queue for this repository.