Deep verification of encrypted files

A tools that verifies encryption of parquet files in a given folder. Analyzes the footer, and then every module (page headers, pages, column indexes, bloom filters) - making sure they are encrypted (in relevant columns). Potentially checking the encryption keys.

We'll start with a design doc, open for discussion.

**Reporter**: [Gidon Gershinsky](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=gershinsky) / @ggershinsky
**Assignee**: [Maya Anderson](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mayaa) / @andersonm-ibm
#### PRs and other links:
- [Design doc](https://docs.google.com/document/d/1c6Vc2X2CPTReWG3aHoBhOBUJ7ghk80wTzcqs04bBDX8/edit?usp=sharing)

_{**Note**: *This issue was originally created as [PARQUET-1989](https://issues.apache.org/jira/browse/PARQUET-1989). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

从链接的设计文档开始，因为该 issue 提议先进行设计讨论，并且没有指定源文件或测试。定义 verifier 的范围和验收标准，以检查加密的 Parquet 页脚、模块、相关列以及可能的密钥；在开始实现之前完成设计共识即表示完成。

由索引模型根据 Issue 内容生成。