parquet-format-structures encryption

[asfimport]

1. Write/read the new Thrift structures (crypto metada)
2. Add encryption/decryption of Parquet metadata Thrift structures

Reporter: Gidon Gershinsky / @ggershinsky
Assignee: Gidon Gershinsky / @ggershinsky

PRs and other links:

• GitHub Pull Request #613

_{Note: This issue was originally created as PARQUET-1228. Please see the migration documentation for further details.}

[asfimport]

Gidon Gershinsky / @ggershinsky:
PR #95