Migrate from Content View features to Page Provider features

The goal is to migrate from Content View features to Page Provider features (Studio Modeler features).

Because a page provider corresponds to the query part of a content view (without the form and results layouts), the first step to migrate content views is to create corresponding page providers that mimic the query part of content views. For each content view, a page page provider with the same name, query (and query parameters?) should be created.