claudia pack does not work with npm workspaces

[mdesousa]

• Expected behaviour: I am using npm 7 workspaces. When I run claudia pack with a module that depends on workspaces, I expect those workspaces to be included in the node_modules folder.

• What actually happens: workspaces are missing in the zip file created by claudiajs. When the lambda is deployed to AWS, you get errors: "Runtime.ImportModuleError: Cannot find module 'xyz'"

• Steps to reproduce the problem: create a project that uses npm workspaces (see https://docs.npmjs.com/cli/v7/using-npm/workspaces). Create a "common" module and a "lambda" module that depends on "common". List them as workspaces in the root package.json. Make sure that "lambda" invokes a function exported from "common". Use "claudia pack" to zip and deploy the lambda function.

• Workaround: if you explicitly declare "common" in the dependencies section of lambda/package.json then everything works as expected. However, this eliminates part of the benefits of npm workspaces where these dependencies are not required.