Improve sample data generation with Task command and wagtail-factories

[matrixise]

Following up on the work done in #169 by @iShelar, we could enhance the sample data generation with the following improvements:

Suggestions

1. Add a Task command for generating sample data (e.g., task django:generate-sample-data) to make it easier to use and consistent with our other task commands

2. Use wagtail-factories instead of plain factory-boy, as it provides specialized factories for Wagtail models that handle the page tree structure and Wagtail-specific fields better

Context

PR #169 already added a great foundation with a generate_sample_data management command using factory-boy. These enhancements would make it even more maintainable and easier for new contributors to use.

cc @iShelar - if you'd like to work on this, I would be really happy! 😊

[iShelar]

Hi @matrixise Thanks for the suggestions.
Happy to take this on 👍

I’ll add a task django:generate-sample-data command and switch the factories to wagtail-factories.

I’ll share a PR once it’s ready.