[Python][Java][Docs] Update the "Integrating PyArrow with Java" documentation section to not use _import_from_c/_export_to_c

[jorisvandenbossche]

Currently, the "Integrating PyArrow with Java" page (https://arrow.apache.org/docs/13.0/python/integration/python_java.html) has an example that uses the low-level _import_from_c / _export_to_c. We should see if we can update this guide to not use those methods directly.

Probably, this is blocked (or would be solved) by re-implementing the pyarrow.jvm module to use the C Data Interface:

• [Python] Rewrite pyarrow.jvm using the C data interface #29891