Move std::io::util to core::io

[bushrat011899]

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ACP: rust-lang/libs-team#755
Tracking issue: #154046
Subset of: #154684

Description

Moves utility types and functions from std::io::util and std::io to core::io, leaving any IO trait implementations behind. They will be moved along with the traits themselves. Certain documentation links had to be amended.

• Chain
• Empty
• Repeat
• Sink
• Take
• empty
• repeat
• sink

---

Notes

• This can be reviewed independently of the other PRs tracked in Tracking Issue for alloc::io and core::io #154046.
• Chain and Take were previously in the main mod.rs file for std::io, but I've chosen to move them into the util.rs file in core::io instead. I think they make more sense in that file, but I'm happy to move them into mod.rs if that's a controversial decision.
• No AI tooling of any kind was used during the creation of this PR.

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