Feature idea: serialize from required CJS modules

Hi Blake,

I have a feature idea: serializing cross-file. Even with the `references` option enabled, requires/imports evaluate to their references (not the fully-serialized data).

Worse comes to worse, one could just bundle their code and then execute this lib's `stringify` fn. Although, ideally, this build step could go away.

[Here's a simple example](https://github.com/harrysolovay/javascript-stringify-issue-repro) of where this might come in handy.

Identifying the difference between node & browser environments seems to be a reason not to implement this... although I'm sure there're good workarounds.

Anyways, please let me know your thoughts on this. Would love to discuss implementations & work on a PR :)

從連結的重現開始，檢查函式庫的 stringify 函式，以及針對必要 CommonJS 模組的 references 選項。比較 Node 與瀏覽器環境中的行為，然後在實作前就預期的跨檔案序列化行為達成共識；該 issue 未指出任何檔案或測試，因此完成條件仍未確定。

由索引模型根據 Issue 內容生成。