Implement java write support for parquet
the different types and cases that can be written is
done via multimethods while the actual WriterSupport is reified

Support writing parquet files
Usage:
  (def pf (open-parquet-file! k (parse-schema "message test{ required binary name; repeated int32 age;}") fname))
  (write! pf {"name" "hi" "age" [1 2 3]})
  (close! pf)