Feature/sx cloud lake

[awxxxxxx]

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[gemini-code-assist]

Summary of Changes

Hello, 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 documentation for TiDB Cloud Lake, a new cloud-native data warehouse service. The changes aim to provide users with a clear understanding of its features, architecture, and a step-by-step guide to get started, facilitating early adoption and exploration of this private beta offering.

Highlights

• New Feature Documentation: Introduced comprehensive documentation for TiDB Cloud Lake, a new cloud-native data warehouse service, detailing its capabilities and usage.
• Updated Overview: Revised the TiDB Cloud Lake overview to include more details on its support for ANSI SQL, semi-structured data processing, vector search, and AI-oriented workflows, along with a private beta notice.
• Enhanced Quick Start Guide: Provided a significantly expanded quick start guide with step-by-step instructions for users to sign up, create a warehouse, and explore the TiDB Cloud Lake service.

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[gemini-code-assist]

Code Review

This pull request significantly updates the documentation for TiDB Cloud Lake. The lake-overview.md file has been revised to provide a more comprehensive and feature-rich description of the service, including its support for analytics, vector, search, and geo workloads, and its cloud-native architecture. It also removes some older "At a Glance" metrics and replaces the "Why Lake?" section with a detailed breakdown of its unified engine and data capabilities. A "Private beta" notice has been added. The lake-quick-start.md file has been transformed from a brief introductory paragraph into a detailed, step-by-step guide for signing up, creating, and exploring a TiDB Cloud Lake warehouse, complete with a "What's next" section for further learning. There is no feedback to provide.