CLI for utility type tasks

[johnymontana]

As suggested in #269, a command line interface for executing utility tasks could be helpful for executing some one-off tasks, such as:

1. writing augmented type definitions to file
2. writing generated graphql type definitions from existing Neo4j instance to file (wrapping inferSchema)
3. enforcing Neo4j database constraints from type definitions
4. enabling data import

This could be bundled with neo4j-graphql.js or possibly be a revival of neo4j-graphql-cli

[johnymontana]

This is work in progress. See: https://www.npmjs.com/package/grandstack

[michaeldgraham]

https://github.com/neo4j-graphql/neo4j-graphql-js/issues/608