br: add new auth method on Azure

[RidRisR]

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[gemini-code-assist]

Summary of Changes

Hello @RidRisR, 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 adds comprehensive documentation for utilizing Azure Managed Identities as an authentication method for TiDB's Backup & Restore (BR) operations with Azure Blob Storage. It outlines the necessary steps and configurations for both system-assigned and user-assigned managed identities, providing clear guidance for users to secure and streamline their backup processes within an Azure environment.

Highlights

• New Azure Authentication Method: This pull request introduces documentation for a new authentication method for TiDB's Backup & Restore (BR) tool when interacting with Azure Blob Storage: Azure Managed Identity.
• Managed Identity Configuration: The documentation details how to configure both system-assigned and user-assigned managed identities, including specific environment variable settings for TiKV and the BR command-line tool.
• Enhanced Security and Simplicity: The addition of Managed Identity support aims to enhance security and simplify access management for backup operations on Azure by leveraging Azure's native identity features.

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[gemini-code-assist]

Code Review

This pull request adds documentation for a new authentication method for Azure Blob Storage using Managed Identity. The changes are clear and well-structured. I've provided a few minor suggestions to improve clarity and conciseness, aligning with the documentation style guide.

[ti-chi-bot]

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