add deepep normal api doc

[zuje123]

add deepep normal dispatch&combine api doc

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在通过新增一份全面的 Markdown 文档，提升 deep_ep 库中 dispatch 和 combine 关键通信 API 的可理解性和可用性。这份文档详细解释了这些 API 如何在分布式 NPU 环境中高效地管理和处理 Token，为开发者提供了清晰的指南，有助于他们更好地集成和使用这些功能。

Highlights

• 新增 API 文档: 引入了 python/deep_ep/NORMAL_API.md 文件，详细记录了 deep_ep 模块中的 dispatch 和 combine 核心 API。
• dispatch API 详情: 文档涵盖了 dispatch 函数的功能说明、接口原型、详细参数、返回值以及使用约束，特别强调了其在多 NPU 和跨节点环境下的 Token 分发作用。
• combine API 详情: 文档详细阐述了 combine 函数的功能说明、接口原型、详细参数、返回值以及使用约束，说明了其在 dispatch 后进行 Token 归约的作用。
• 分布式环境支持: 明确了这些 API 在多 NPU (Intranode) 和跨节点 (Internode) 环境下高效处理 Token 分发与归约操作的目的。

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[gemini-code-assist]

Code Review

This pull request adds API documentation for the dispatch and combine functions in a new markdown file. The documentation is comprehensive and well-structured. I've provided a few suggestions to improve clarity and consistency in parameter descriptions and formatting.