Fix inheritable notification methods

[thiagoyoussef]

Pull Request

Summary:
Inheriting notification methods from ApplicationNotifier is throwing an error when Notification is a module.
This PR ensures it is a class when setting it.

Related Issue:
related #514

Description:

To reproduce:

• rails version > 8.1.0
• rails noticed:install:migrations
• rails db:migrate
• bin/rails zeitwerk:check

app/notifiers/application_notifier.rb:1:in '<main>': superclass must be an instance of Class (given an instance of Module) (TypeError)

notifier.const_set :Notification, Class.new(const_defined?(:Notification) ? const_get(:Notification) : Noticed::Notification)

Testing:

Screenshots (if applicable):

Checklist:

• Code follows the project's coding standards
• [] Tests have been added or updated to cover the changes
• Documentation has been updated (if applicable)
• All existing tests pass
• Conforms to the contributing guidelines

Additional Notes: