Update website for roadmap and version compatibility

[Abacn]

• Update roadmap page adding Beam 3, removing deprecated roadmaps

• Added version compatibility table for Java, Python, SQL

• Document Calcite dialect-specific function for Beam SQL

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly updates the Apache Beam website documentation to provide clearer and more current information regarding version compatibility and feature roadmaps. It introduces detailed tables for Java, Python, and Beam SQL (Calcite) version support, announces the upcoming Beam 3, and formally deprecates or removes content related to ZetaSQL and Euphoria, ensuring the documentation accurately reflects the project's current state and future direction.

Highlights

• Roadmap Updates: The roadmap page now includes information about Beam 3 and removes deprecated sections for ZetaSQL and Euphoria.
• Version Compatibility Tables: New tables have been added to document version compatibility for Java, Python, and Beam SQL (Calcite) with various Beam releases.
• Calcite SQL Documentation: Clarifications and new details have been added regarding Calcite scalar functions and the support for dialect-specific functions in Beam SQL.

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[github-actions]

Assigning reviewers:

R: @kennknowles for label website.

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[Abacn]

R: @kennknowles @damccorm

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[damccorm]

Thanks!