lio 0.2.0

A platform-independent I/O library with native support for io_uring (Linux), IOCP (Windows), and kqueue (macOS)
Documentation 
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# When adding `op`:
- Add test in `tests/test_<op>.rs`.
- Add test in `tests/test_callback.rs`.
- Add test in `tests/test_detach_safe.rs`.