Refactor code base structure

[cweems]

We want to split up proxypoc.js into modules for better readability and testing.

Create basic folder structure based on: https://blog.logrocket.com/organizing-express-js-project-structure-better-productivity/

• migrate router methods into index or routes.js. All routes should be defined in same file and operate on a JS module. Reduce mix of routes and business logic.
• move router controllers into their own modules.
• Identify dependencies that are used by multiple modules. Migrate to utils.