[WIP]: add v8.5.5 release notes

[qiancai]

What is changed, added or deleted? (Required)

As in the title, this PR adds the release note doc for v8.5.5.

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.

• 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:
• 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

[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 document for the upcoming TiDB 8.5.5 release notes. It establishes the structure and includes various placeholder sections for features, compatibility changes, improvements, and bug fixes, ensuring a consistent format for future documentation.

Highlights

• New Release Notes Document: A new markdown file, "releases/release-8.5.5.md", has been added to document the release notes for TiDB version 8.5.5.
• Release Notes Template: The newly added file contains a comprehensive template for the release notes, including sections for features, compatibility changes, improvements, and bug fixes, all populated with placeholders.

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[gemini-code-assist]

Code Review

This pull request introduces a release note template for TiDB v8.5.5. The template is well-structured overall. My review includes suggestions to enhance the Improvements and Bug fixes sections by adding component-specific placeholders, making the template more comprehensive and user-friendly for technical writers. I have also included minor formatting suggestions to improve table clarity and ensure the file ends with a newline, adhering to common best practices.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

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[YuJuncen]

LGTM

[rleungx]

LGTM