Feat add new features

[Stef-Rousset]

🎩 Description

This PR adds different features:

• adds alignment information in comments for external proposals
• adds a reference to comments, and adds the possibility to retrieve via the api a single comment with its reference (screenshot one)
• adds the possibility to filter the external proposals added to the platform by container (cf screenshot two)

It also refactor the code by adding presenters to clean models, and removes migration files that creates the models.

Testing

If you are testing from an existing app, run in the console bundle exec rake railties:install:migrations, and then bundle exec rake db:migrate, and eventually bundle exec rake comments:add_reference

Testing the reference for comments:

• to check in the console that all comments have a reference, you can run in your console Decidim::Comments::Comment.where(reference: nil), which should return an empty array []
• run also Decidim::Comments::Comment.all.size and Decidim::Comments::Comment.where.not(reference: nil).size, which should both return the same result
• you can check that the reference of a comment is well constructed. For that run Decidim::Organization.first.reference_prefix, run Decidim::Comments::Comment.first.created_at and note month and year of creation, and then run Decidim::Comments::Comment.first.reference, and check that the reference is like "organization prefix"-"COMM"-"year of creation"-"month of creation"-"id"
• in the application, you can go to http://localhost:3000/api/v1/data/contributions. In a proposal that children, copy the reference of a comment, and then go to http://localhost:3000/api/v1/data/contributions/ref_of_the_comment, and see that the informations of comment are displayed (screenshot one).

Testing the container filter:

• In the FO, go to an assembly with proposals, note its slug.
• In your console, run Decidim::Assembly.where(slug: "your_assembly_slug").first.reference and copy the reference
• As an admin, go to the proposals component of a participatory process, enable integrations and provide the url "http://localhost:3000?container=your_assembly_reference", and save (cf screenshot two)
• in the FO, go to the proposals index of your process, and see that the external proposals displayed are the ones belonging to the assembly chosen.

Testing aligment:

• As a user, go to the assembly you selected in testing the container filter, go to its proposals and add a comment with in favor alignment
• As a user, go to the process which includes proposals of the assembly as external proposals, click on the external_proposal where you add a comment and see that the aligment information is displayed (screenshot three)

Tasks

• Add specs

📷 Screenshots

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