Consider updating diagnostic channel event names for bundled modules

https://openjs-foundation.slack.com/archives/C01QF9Q31QD/p1766166962883319

I'd like to propose that when Node.js bundles an external module that generates diagnostic_channel events, that those event names are differentiated from the upstream names. Consider undici, it generates events such as undici:request:pending-requests (https://undici.nodejs.org/#/docs/api/DiagnosticsChannel?id=undicirequestpending-requests). These events are emitted as-is from the Node.js bundled version of Undici, thus making it impossible to determine if the event was generated from the standalone module or the bundled module.

In day-to-day usage, this is not technically a problem. I am sure we can think of other cases where it might be an issue, but my current problem is that I need to retrieve the module version for the module that generated the event. I cannot currently rely on registerHooks to solve this because v20 does not support it.

Regardless, I just think it would be better to differentiate between upstream and bundled in event emissions for clarity.

リンクされた Slack の議論と、issue 内の diagnostic_channel および Undici のイベントに関する参照から始めてください。組み込みモジュールとスタンドアロンモジュールを区別する命名スキームを、Node.js v20 の制約も含めて決定し、実装前に想定されるイベント名と互換性の動作を定義してください。