ng-log: add package

[HOMODELUNA]

google glog于2025年6月30日存档,并停止维护, 有两个可能的替代品:

abseil库 有日志功能, 它已经在仓库中

ng-log 是一个轻量级日志库, 与glog保持api兼容

[gemini-code-assist]

Summary of Changes

Hello @HOMODELUNA, 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!

此拉取请求将 ng-log C++ 日志库引入到仓库中。此举是由于 google glog 即将归档，而 ng-log 作为其轻量级且 API 兼容的替代方案。主要更改是添加了 xmake.lua 配置文件，以实现 ng-log 的构建和集成，包括其各种依赖项和平台特定设置。

Highlights

• 新增库引入: 引入 ng-log 作为新的软件包。
• Glog 替代方案: ng-log 被添加作为 google glog 的潜在替代品，后者即将被归档。
• Xmake 配置: 提供了 ng-log 的 xmake.lua 配置，包括依赖、构建选项和测试代码片段。
• Gflags 依赖处理: 特别处理了 gflags 依赖问题，在 cmake 版本兼容性问题解决前，暂时使用 master 分支。
• Windows 宏定义: 为 Windows 平台添加了特定的宏定义 NGLOG_NO_ABBREVIATED_SEVERITIES。
• 日志头文件补丁: 修改 ng-log/logging.h，为 0.7.0 及更高版本添加 NGLOG_USE_EXPORT。

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[gemini-code-assist]

Code Review

此拉取请求添加了对 ng-log 包的支持，作为 glog 的替代品。整体实现是合理的，但在依赖管理和 API 使用方面有一些可以改进的地方。我提出了一些建议，以提高构建的稳定性和代码的健壮性。

[gemini-code-assist]

在 on_load 函数中，为了解决 gflags 的 CMake 版本问题，您将依赖强制指定为 gflags master。虽然这可以解决构建问题，但直接依赖 master 分支会使构建过程不稳定且不可复现，因为 master 分支的内容是随时可能变化的。

为了提高构建的稳定性和可复现性，建议您将依赖固定到 gflags master 分支的某一个具体的 commit hash，而不是使用 "master" 这个浮动的引用。例如，使用 package:add("deps", "gflags <commit-hash>")。

[luadebug]

I think we should supply https://github.com/gflags/gflags/pull/367.diff as patch to gflags package instead of checking out next to master branch.

[HOMODELUNA]

发现报错的地方都是windows + 动态库 + MT, 推测是库本身不支持MT运行时,
参考 #5531