Implement Lazy Loading of Commands

[bshifaw]

Instead of manually importing the subcomands into the main file, have click import them lazily. While this feature isn't directly supported, there are documentation on providing solutions for it like this article: https://github.com/pallets/click/blob/9ef08784f1c8cbd05e7a268a7c7a23348e158653/docs/complex.rst