Add REST API endpoint for the script

[pdmnyberg]

As a developer I want to have an endpoint exposing the core query functionality of the application so that I can provide a nicely decoupled user experience that can mask potential performance issues and improve the user experience.

This endpoint should:

• Be properly sanitized in order to keep the system safe
• Limit queries to a size that is reasonable to execute within an acceptable time window
• Include integration tests
• Be properly documented