Custom directive runs after database insertion

[gpaluk]

Custom directives run after the data has been injected into the database and therefore unfit for the most obvious use-cases. For example, when annotating a field with validation prior to being inserted into the database is not possible. The only alternative to use a custom resolver for almost every field. This poses the problem that all graphql schema declarations would need to be annotated with neo4j_ignore thus rendering the entire makeAugmentedSchema almost obsolete.