add launch_server and StartArgs (#1119)

[sufubao]

#1119
通过统一的StartArgs类和launch_server函数简化了服务器启动流程

[gemini-code-assist]

Summary of Changes

Hello @sufubao, 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!

此拉取请求旨在通过引入一个统一的 StartArgs 配置类和一个 launch_server 函数来简化LightLLM服务器的启动和配置管理。这些更改使得服务器的初始化过程更加标准化和易于维护，同时增强了配置的灵活性，并提供了新的API端点来查询服务器的运行时信息。此外，还改进了服务器的信号处理机制，以确保在不同场景下的优雅关闭。

Highlights

• 统一服务器启动: 引入 launch_server 函数和 StartArgs 类，简化服务器启动逻辑，使其更加标准化和易于维护。
• 新增API端点: 增加了 /get_server_info 和 /get_weight_version 两个新的HTTP API端点，用于获取服务器配置和权重版本信息。
• 增强配置管理: StartArgs 数据类得到显著更新，新增了多个配置参数，并调整了现有参数的默认值和选项，以提供更灵活的服务器配置。
• 改进信号处理: 增加了对 SIGHUP 信号的优雅处理，确保在终端关闭时服务器能够平稳关闭，避免资源泄露。
• 设备检测优化: get_current_device_name 函数现在在无法检测到GPU时会抛出 RuntimeError，而不是返回 None，提高了错误处理的明确性。

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[gemini-code-assist]

Code Review

本次代码变更通过引入 StartArgs 数据类和 launch_server 函数，简化了服务器的启动流程，这是一个很好的重构，提升了代码的结构性和清晰度。此外，还增加了用于获取服务器信息的API端点，并改进了信号处理以实现优雅停机。

然而，在 lightllm/server/core/objs/start_args_type.py 文件中存在一个严重问题，即字段重复定义，这将导致程序启动失败。此外，还有一些可以改进的小地方。请查看具体的审查意见。

[gemini-code-assist]

字段 httpserver_workers 在 StartArgs dataclass 中被重复定义了（第一次在第17行）。这会导致 TypeError，是一个严重错误。请移除此处的重复定义。