[doc](function) Add stack table function documentation - #4059

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-node@v3, actions/setup-python@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

English current and 4.x docs are strongly synchronized%2C but the 4.x counterpart is missing. Add it or explain the version-specific exception in the PR description. Owner%3A @apache/doris-website-maintainers

Rendered SEO title is duplicated across indexable pages%3A "STACK - Apache Doris". Add a version%2C locale%2C or page-specific qualifier. Owner%3A @apache/doris-website-maintainers

Rendered SEO title is duplicated across indexable pages%3A "STACK - Apache Doris". Add a version%2C locale%2C or page-specific qualifier. Owner%3A @apache/doris-website-maintainers

SEO description should be 80-160 characters; current length is 40. Owner%3A @apache/doris-website-maintainers

Sidebar references missing doc id%3A Read/Write Separation. Owner%3A @apache/doris-website-maintainers

Sidebar references missing doc id%3A @docusaurus/plugin-content-docs. Owner%3A @apache/doris-website-maintainers