cloud: add private link connection docs

[shiyuhang0]

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[gemini-code-assist]

Summary of Changes

Hello @shiyuhang0, 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 a suite of new documentation focused on establishing secure and efficient Private Link connections for TiDB Cloud's dataflow services. These guides provide detailed, step-by-step instructions for connecting TiDB Cloud to various external data sources, including AWS RDS, Alibaba Cloud RDS, AWS Confluent Dedicated clusters, and self-hosted Kafka clusters on AWS, all leveraging cloud-native private link services. The aim is to facilitate private, direct, and secure data transmission, improving both security posture and network performance for users integrating TiDB Cloud with their existing cloud infrastructure.

Highlights

• New Private Link Connection Documentation: Introduced a comprehensive set of documentation for establishing Private Link connections from TiDB Cloud to various external data sources.
• Support for AWS RDS and Alibaba Cloud RDS: Added detailed guides for setting up secure Private Link connections to both AWS RDS and Alibaba Cloud RDS instances.
• Integration with AWS Confluent and Self-Hosted Kafka: Provided new documentation for connecting TiDB Cloud to AWS Confluent Dedicated clusters and self-hosted Kafka clusters on AWS via Private Link.
• Overview and Management of Private Link Connections: Included an overview document explaining the Private Link Connection for Dataflow feature, its types, domain attachment, and general management steps via Console and CLI.

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[gemini-code-assist]

Code Review

This pull request adds several new documentation pages related to setting up Private Link connections for TiDB Cloud Dataflow services. The new documents cover connections to Alibaba Cloud RDS, AWS Confluent, AWS RDS, and self-hosted Kafka on AWS, along with a general overview page. My review focuses on improving clarity, correcting grammatical errors and typos, and ensuring consistency with the repository's style guide. I've provided suggestions to improve sentence structure, use consistent terminology, and fix formatting for better readability.

[gemini-code-assist]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[zhangyangyu]

need beta?

[shiyuhang0]

我理解不需要 beta，console 也没标 beta。麻烦 @hfxsd 改回去？

[zhangyangyu]

这啥意思？