Create CLI tooling to switch between submodules.

Currently it is a huge pain for developers who also need to deploy to switch between various configuration submodules. The process involves manually editing the `.gitmodules` file as well as potentially modifying the contents of `.git` among other things.

We should alleviate these issues with some clever bash scripting. There should be a simple JSON file that can be git ignored which contains the URLS for each submodule remote. The script should serve as a mechanism to switch between various submodule remotes as well as check out the submodule to the correct version by modifying all the necessary files properly.