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core: Add `BorrowedCursor::with_unfilled_buf` Implementation of https://github.com/rust-lang/libs-team/issues/367. This mainly adds `BorrowedCursor::with_unfilled_buf`, with enables using the unfilled part of a cursor as a `BorrowedBuf`. Note that unlike the ACP, `BorrowedCursor::unfilled_buf` was moved to a `From` conversion. This is more consistent with other ways of creating a `BorrowedBuf` and hides a bit this conversion that requires unsafe code to be used correctly. Cc rust-lang/rust#78485 rust-lang/rust#117693