Improve plugin external packages installation

[zAlweNy26]

Actually the external packages are installed in the main package.json of the project. We should find a way to have those packages somewhere else.
Maybe by forcing to have a package.json in each plugin folder? So this way it's easier to manage packages but it would increase project size, caused by the duplication of packages in all the node_modules.
Is it possible to have multiple package.json but only the root node_modules folder? Yes, https://bun.sh/docs/install/workspaces