[PR] fix(python): Add iterator for null/na type [arrow-nanoarrow]

[via GitHub]

paleolimbot opened a new pull request, #467:
URL: https://github.com/apache/arrow-nanoarrow/pull/467

   Closes #465.
   
   ```python
   import nanoarrow as na
   import pyarrow as pa
   
   arr = na.array(pa.array([None]))
   arr.schema
   #> <Schema> na
   arr
   #> nanoarrow.Array<na>[1]
   #> None
   ```


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