[proposal]: Mark all node_modules dependencies as external

[unrevised6419]

A clear and concise description of what the feature is

Mark all node_modules dependencies as external to avoid code duplication.

Why should this feature be included?

When developers create plugins within the Strapi application repository, there can be a case when new dependencies are added in the project root, but they are used in both, the application and plugin, and on build the dependency code will be duplicated.

Also, a plugin is only consumed by a Strapi application, so it should not care what node_modules dependencies should be bundled or not, that is Strapi responsibility.

Please provide an example for how this would work

I made this a video to provide a better explanation.

https://youtu.be/WxyGLWjZ2Qs

Another real example of the problem

https://youtu.be/hF74HFJ0K1s

Another solution would be with ESLint to disallow any imports outside the plugin folder.

https://github.com/import-js/eslint-plugin-import/blob/main/docs/rules/no-extraneous-dependencies.md

For now I solved it with ESLint plugin, found 3 dependencies that were bundled with the plugin. This should also increase build speed.

PS: I'm not sure if this is more an issue for sdk-plugin or pack-up

[unrevised6419]

Potentially related issue strapi/sdk-plugin#77