Add generators for components etc

[chadfurman]

There should be a command to allow you to quickly create a table, function, schema, type, component, mutation, or route.

any migration file lists out other migrations and lets you check off depencies (similar to yarn upgrade-interactive), and then adds a migration of the form _<_optional> to the plan

Components generate the folder, the js file (along with a basic component boilerplate), the css file, and a basic Jest snapshot test

routes generate the route file, optionally add the file to routes.js, generate the view file similar to the component, and prompt for a root query for the route (or generating a commented out root query example and mentioning that the user must change it)

Generating a mutation creates the file in shared/relay/mutations