Add an option to warn/list imported cjs modules

[tobiasdiez]

Describe the feature

Since it's not always clear if a given library is imported via esm or cjs (or even properly supports esm), it would be nice to have a command that deeply analyzes all imports and lists all cjs ones.

Reference: https://github.com/rollup/plugins/tree/master/packages/commonjs#inter-plugin-communication

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.

[antfu]

In the future, once https://github.com/nuxt/devtools supports build mode, we could have a page from https://github.com/antfu/vite-plugin-inspect or other analyzers to list cjs/esm dependencies bundled.