Implement exam feature as a Rails engine plugin

[stgm]

Refactor the exam features to act as a plugin in the project.

• Add Exam Plugin Engine:

  • Add plugins/exam/lib/plugins/exam/engine.rb to define the Plugins::Exam::Engine class and configure necessary settings and dependencies.
  • Mount the engine in the main application's routes.

• Move Controllers to Plugin:

  • Add plugins/exam/app/controllers/plugins/exam/admin/exams_controller.rb and plugins/exam/app/controllers/plugins/exam/exams_controller.rb to move the Admin::ExamsController and ExamsController respectively.
  • Update controllers to inherit from Plugins::Exam::ApplicationController.

• Move Models to Plugin:

  • Add plugins/exam/app/models/plugins/exam/exam.rb and plugins/exam/app/models/plugins/exam/pset.rb to move the Exam and Pset models respectively.

• Move Views to Plugin:

  • Add plugins/exam/app/views/plugins/exam/admin/exams/edit.html.erb, plugins/exam/app/views/plugins/exam/admin/exams/index.html.erb, and plugins/exam/app/views/plugins/exam/exams/index.html.erb to move the corresponding views.

• Delete Old Files:

  • Delete app/controllers/admin/exams_controller.rb, app/controllers/exams_controller.rb, app/models/exam.rb, app/views/admin/exams/edit.html.erb, app/views/admin/exams/index.html.erb, and app/views/exams/index.html.erb.

• Update Routes:

  • Modify config/routes.rb to mount the exam plugin engine and update routes accordingly.

• Update Navigation Helper:

  • Modify app/helpers/navigation_helper.rb to define methods for registering and retrieving menu items.
  • Add plugins/exam/config/initializers/menu_item.rb to register the exam menu item.

• Update Menu Items View:

  • Modify app/views/application/_menu_items.html.erb to include registered menu items.

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