PARQUET-1428: Move columnar encryption into its feature branch
PARQUET-1428: Move columnar encryption into its feature branch

Revert "PARQUET-1227: Thrift crypto metadata structures (#94)"

This reverts commit 518e206c3e6586b76e8315d5f62a8666ed62fa90.

apache/parquet-format,apache/parquet-format,apache/parquet-format