feat: Addition of custom proposal states

[AyakorK]

🎩 Description

This adds the module Custom Proposal States to the Decidim-App

📌 Related Issues

• Release 2.4 - Ajout module custom proposal states

Testing

Describe the best way to test or validate your PR.

🚨 When initiating you application make sure you run bundle exec rake deface:precompile to have the modifications from the module on your Proposals Panel

Example:

• Log in as admin
• Access Backoffice
• Go to a participatory process
• Access proposals component
• Make sure you have the States button (otherwise check the rotating light)
• Click on it and make sure there are custom states
• Try to create new ones
• Try to update them
• Try to delete them
• Make sure you can apply them to your proposals

Tasks

• Update specs with the module's factory for extended_proposals
• Add migrations
• Add module

📷 Screenshots

Please add screenshots of the changes you're proposing if related to the UI

[Stef-Rousset]

tested it, everything works as expected !

[BarbaraOliveira13]

It works locally for me 🎉