Monoio IO Wrapper

An io wrapper to bind std io and monoio async io.

|=== |Return |do_io |read / write

.2+|SafeIO .2+| Current async r/w result | 1. WouldBlock: Empty(r) or Full(w) and need calling do_io |2. Other: success io or last do_io error

.2+|UnsafeIO | 1. WouldBlock: Not capture mem block info, need calling read / write | 1. WouldBlock: mem block info is captured and need calling do_io |2. Other: current async r/w result | 2. Other: success io or last do_io error

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