Add guide on data masking

[Blargian]

Summary

Adds a guide on how to mask data in ClickHouse:

• using string replacement functions
• using a VIEW with appropriate access control
• using query masking for logging

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

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Project	Deployment	Preview	Updated (UTC)
clickhouse-docs	Ready	Preview	Sep 18, 2025 10:04am