Move `BorrowedBuf` and `BorrowedCursor` from `std:io` to `core::io`#117694

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jmillikin:core-io-borrowed-buf

Nov 9, 2023

Commits on Nov 8, 2023

Move `BorrowedBuf` and `BorrowedCursor` from `std:io` to `core::io`
jmillikin
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