Add support for specifying which Neo4j database to push data to

[adam-in-ict]

The enterprise version of Neo4j allows for multiple databases hosted on a single Neo4j server. Adding an optional configuration value to specify the database to push to could be beneficial.

The storage section for a Neo4j configuration could look something like this:

storage:
  engine: neo4j
  config:
    username:<username>
    password:<password>
    uri: bolt:<uri>
    database: neo4j

We would need to decide how to handle errors if a user tried to specify a database name while running the community edition which does not allow multiple databases. One option would be to query the database initially using the dbms.components() call to get the edition and only allow a database to be specified when it is enterprise.