Add recommendations for option parsing

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In C++ my experience says:

- If it is okay to use boost, use boost::program_options, it is a solid library.
- It is often not okay to use boost. The headers alone are > 50 MB 🙀 and contain > 13,000 files. And boost::program_options requires linking a precompiled library. This is massive weight and complexity for a build system just to parse options.
- So for lightweight C++ libs that might not otherwise have any dependencies we need to recommend a very lightweight option parsing solution.

/cc @GretaCB @joto @mapbox/core-tech @danpat

该 issue 未指定任何文件、测试或入口点。研究轻量级的 C++ 选项解析方案，并根据已陈述的约束比较它们在依赖项、头文件和链接方面的成本。完成的标准是记录一份针对轻量级 C++ 库的明确建议，同时说明何时仍适合使用 boost::program_options。

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