[Java/Python] Add support for dictionary type to pyarrow.Field.from_jvm

[asfimport]

The DictionaryType is a bit more complex as it also references the dictionary values itself. This also needs to be integrated into pyarrow.Field.from_jvm but the work to make DictionaryType working maybe also depends on that pyarrow.Array.from_jvm first supports non-primitive arrays.

Reporter: Uwe Korn / @xhochy

Related issues:

• [Java/Python] in-process vector sharing from Java to Python (is a child of)

_{Note: This issue was originally created as ARROW-2610. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm: This should be less complex now after the recent DictionaryType changes