Simplify navigation graph definition in "Lists"

[MGaetan89]

Pull request

Description

As reported by @waliid in #299 (comment), there is quite some code duplication in the demo apps in order to handle the various content list in the navigation graph definition. This PR simplifies that by making the code more generic.

Changes made

• Introduce a ContentListFactory interface to group the code required to create a content list
• Use that interface to dynamically create each relevant entry in the navigation graph definition

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.