[libc++] NFC: Move unwrap_iter to its own header
This re-applies 9968896c, which was reverted in b13edf6e because it broke the build. Differential Revision: https://reviews.llvm.org/D103369
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This re-applies 9968896c, which was reverted in b13edf6e because it broke the build. Differential Revision: https://reviews.llvm.org/D103369