Allow specifying planner and runtime for neo4j queries

[dominikgrygiel]

This pull introduces

You can now specify planner and/or runtime for neo4j queries (https://neo4j.com/docs/cypher-manual/current/query-tuning/query-options/).

Neo4j::Core::Query.new(parser: 2.0, planner: 'cost', runtime: 'compiled')

Pings: @cheerfulstoic @subvertallchris