Index each attribute

[cormander]

As a developer I want search queries on large data sets to be performant while keeping write performance so that both read and write queries happen fast.

This feature is done when:

• When an (:Attribute) is created, its corresponding Node type is created, and index created
• Each (:PersonAttribute) has a second Node that is indexed on value that corresponds to its [:ATTRIBUTE_TYPE]
• A recurring job exists that finds (:PersonAttribute) without a second Node, and sets it