Move std::io::Cursor to core::io

[bushrat011899]

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

Description

Moves std::io::Cursor to core::io, leaving the IO trait implementations behind. They will be moved along with the traits themselves. Certain documentation links had to be amended, and a private/unstable into_parts_mut method was added to allow the internals to remain private.

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Notes

• This can be reviewed independently of the other PRs tracked in Tracking Issue for alloc::io and core::io #154046.
• No AI tooling of any kind was used during the creation of this PR.

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