Show string min/max in parquet-cli/tools meta command

It's better to show min/max of string type by default when using parquet-cli/parquet-tools meta command, by setting 'parquet.strings.signed-min-max.enabled' to true

**Reporter**: [EdisonWang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=EdisonWang) / @EdisonWang
#### PRs and other links:
- [GitHub Pull Request #687](https://github.com/apache/parquet-mr/pull/687)

_{**Note**: *This issue was originally created as [PARQUET-1668](https://issues.apache.org/jira/browse/PARQUET-1668). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

从 parquet-cli/parquet-tools 的元命令开始，检查其配置如何处理 parquet.strings.signed-min-max.enabled。元命令默认显示字符串 min/max 值即表示完成；在进行更改之前，请查看 GitHub Pull Request #687，了解已有的工作。

由索引模型根据 Issue 内容生成。