Feature: Implement plugin Wizard

[MeesvanStraten]

Since there is a proof of concept and research is finished we can start the implementation of the plugin Wizard.
Use the input from: #239

Implement the Wizard so that new plugins are easily intergrated without much work on the back-end.

[niraymak]

Documentation can be found here: https://docs.google.com/document/d/1P6SJc6jy4Xi4XOfpW0R7o9nMidDFWA5z5aXkzCt1g1c/edit?usp=sharing

Ruben will pick-up the implementation of the basis of this project. When the basis is there, we can start adding different sources.
We are aiming to get the basis ready before the holidays.

[RubenFricke]

After a meeting with @Brend-Smits and @DaveyHurkmans we decided to store page objects in the data source. This way the front-end is able to figure out what order the pages should get made visible (this can differ for each data source). So, the data source has a many to many relation with the wizard page objects.