Disable crc checksums by default

CRC checksums have been introduced in 1.11.0. This negatively impacts performance, and I would like to make it an opt-in choice.

**Reporter**: [Fokko Driesprong](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=fokko) / @Fokko
**Assignee**: [Fokko Driesprong](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=fokko) / @Fokko
#### PRs and other links:
- [GitHub Pull Request #700](https://github.com/apache/parquet-mr/pull/700)

_{**Note**: *This issue was originally created as [PARQUET-1695](https://issues.apache.org/jira/browse/PARQUET-1695). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

从 Pull Request #700 以及描述中链接的原始 PARQUET-1695 issue 开始，以了解提议的校验和默认值变更。验证校验和是否变为 opt-in，同时保留现有选项；该 issue 未指定任何源文件或测试。

由索引模型根据 Issue 内容生成。