Add 'mask' command to parquet-tools/parquet-cli
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Description
Some personal data columns need to be masked instead of being pruned(Parquet-1791). We need a tool to replace the raw data columns with masked value. The masked value could be hash, null, redact etc. For the unchanged columns, they should be moved as a whole like 'merge', 'prune' command in Parquet-tools.
Implementing this feature in file format is 10X faster than doing it by rewriting the table data in the query engine.
**Reporter**: [Xinli Shang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=shangx@uber.com) / @shangxinli
**Assignee**: [Xinli Shang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=shangx@uber.com) / @shangxinli
#### Subtasks:
- [ ] [Add null command ](https://github.com/apache/parquet-java/issues/2525)
- [ ] [Add hash functionality ](https://github.com/apache/parquet-java/issues/1601)
**Note**: *This issue was originally created as [PARQUET-1792](https://issues.apache.org/jira/browse/PARQUET-1792). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
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