Dark theme for custom formatters in devtools dark mode

I'm not sure how custom formatters work, but the logs are currently hard to read when devtools is in dark mode. I imagine the colors are customizable, but it would be nice if the default formatters had a config option for viewing in dark mode (any dark foreground colors would be swapped with lighter ones).

该 issue 没有指出任何文件、测试或入口点。首先研究自定义 formatter 如何向 Chrome DevTools 提供颜色，以及如何检测 DevTools 的深色模式；定义配置行为，并验证默认 formatter 输出在两种主题下都保持可读。

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