Implement Data Generators plugin type with a corresponding Data Provider plugin instance that relies on them

Data Generators can be used for demonstration purposes to show how certain drawers work. Technically they perform a subset of tasks that Data Providers do but are easier in implementation and always provide data in one standard format so they don't need to provide explicit info on output type and interface to obtain data.

@todo: remove RandomDataProvider plugin, currently serves as an example of a provider that uses a route with a controller to provide data