Create CLI tooling to switch between submodules.

[ikhatri]

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.