Functions: start generating tuple functions from source

[Blargian]

Summary

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

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs	Ready	Preview	Comment	Oct 16, 2025 2:13pm

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[Copilot]

Pull Request Overview

Adds support for generating documentation for tuple functions by integrating a new "Tuple" category into the autogeneration script.

• Adds "Tuple" to FUNCTION_CATEGORIES
• Adds tuple-functions.md to source and destination insertion file lists

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