Add release-notes for 0.21.0

[ziggie1984]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @ziggie1984, 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 introduces the initial framework for the 0.21.0 release notes. It establishes a structured Markdown document that will serve as the central place to detail all changes, new features, improvements, and technical updates for the upcoming release, ensuring a clear and organized record of development progress.

Highlights

• New Release Notes Document: A new Markdown file, "docs/release-notes/release-notes-0.21.0.md", has been added to the repository.
• Release Notes Structure: This new file provides a comprehensive template for the 0.21.0 release notes, outlining sections for bug fixes, new features, improvements, technical updates, and contributors.

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[gemini-code-assist]

Code Review

This pull request adds the release notes file for version 0.21.0. The file is based on the template, which is great. I've found a few inconsistencies and potential issues: a missing Database section which leads to a broken link, a potentially broken anchor in the Contributors link, and a duplicate Code Health section that could cause confusion. My review includes suggestions to fix these issues to improve the clarity and correctness of the release notes. Once these are addressed, the file should be in good shape.

[yyforyongyu]

Thank you❤️

[bitromortac]

LGTM ⚡ (there are still nits from gemini to address).

[yyforyongyu]

Will hold on to merging until #10252 is merged so we have a clean history for 0.21