Add support for open-ended questions in admin section

Introduce a new "open" votation type for poll questions in the admin
interface. This type allows open answers provided by the user.

app/components/admin/votation_types/fields_component.rb

@@ -10,7 +10,8 @@ class Admin::VotationTypes::FieldsComponent < ApplicationComponent
     def descriptions
       {
         unique: t("admin.polls.votation_type.unique_description"),
-        multiple: t("admin.polls.votation_type.multiple_description")
+        multiple: t("admin.polls.votation_type.multiple_description"),
+        open: t("admin.polls.votation_type.open_description")
       }
     end
 

app/models/poll/question.rb

@@ -27,7 +27,7 @@ class Poll::Question < ApplicationRecord
   accepts_nested_attributes_for :question_options, reject_if: :all_blank, allow_destroy: true
   accepts_nested_attributes_for :votation_type
 
-  delegate :multiple?, :vote_type, to: :votation_type, allow_nil: true
+  delegate :multiple?, :open?, :vote_type, to: :votation_type, allow_nil: true
 
   scope :sort_for_list, -> { order(Arel.sql("poll_questions.proposal_id IS NULL"), :created_at) }
   scope :for_render,    -> { includes(:author, :proposal) }

app/models/votation_type.rb

@@ -3,7 +3,7 @@ class VotationType < ApplicationRecord
 
   QUESTIONABLE_TYPES = %w[Poll::Question].freeze
 
-  enum :vote_type, { unique: 0, multiple: 1 }
+  enum :vote_type, { unique: 0, multiple: 1, open: 2 }
 
   validates :questionable, presence: true
   validates :questionable_type, inclusion: { in: ->(*) { QUESTIONABLE_TYPES }}