Functions: generate date and time functions

[Blargian]

Summary

Adds date and time functions to be generated from system tables automatically

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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Name	Status	Preview	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	Aug 1, 2025 1:24pm

[Blargian]

Needs #4107 first