[3.13] gh-122559: Synchronize C and Python implementation of the io module about pickling (GH-122628) #133381
      
        
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In the C implementation, remove reduce and reduce_ex methods that always raise TypeError and restore getstate methods that always raise TypeErrori.
This restores fine details of the pre-3.12 behavior and unifies both implementations.
(cherry picked from commit e9253eb)