v8.5.3: add release notes

[Oreoxmt]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Add release notes for v8.5.3

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from: v8.5.3: add release notes docs-cn#20662
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Summary of Changes

Hello @Oreoxmt, 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 foundational documentation for the TiDB 8.5.3 release. It establishes a new Markdown file that will serve as the official release notes, providing a structured outline for detailing all significant updates, including compatibility considerations, performance enhancements, and resolved issues across the TiDB ecosystem.

Highlights

• New Release Notes File Created: A new Markdown file, releases/release-8.5.3.md, has been added to the repository, specifically designated for the TiDB 8.5.3 release notes.
• Standardized Structure: The newly added file provides a comprehensive template for release notes, featuring dedicated sections for "Compatibility changes", "Improvements", and "Bug fixes". These sections are further organized by major TiDB components (TiDB, TiKV, PD, TiFlash) and various associated tools (Backup & Restore, TiCDC, TiDB Data Migration, TiDB Lightning, Dumpling, TiUP).
• Placeholder Content: The document includes generic placeholders for future issue references and contributor IDs, along with several example entries marked as "(dup)" that appear to be copied from other existing release notes, indicating a ready-to-fill structure.

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[gemini-code-assist]

Code Review

This pull request adds the release notes file for TiDB v8.5.3. The file is based on a template and includes several cherry-picked items from other releases, which is standard practice. The structure and content are consistent with other release notes. I've made one minor suggestion to format a technical term for better readability and consistency.