Moderate legislation proposals (#3602)

Moderate legislation proposals

- added a controller for moderation/legislation
- updated view to appropriate link + added route
- added a spec
- Feature test
- test for faded
- javascripts for visual effects

app/controllers/moderation/legislation/proposals_controller.rb

@@ -0,0 +1,19 @@
+class Moderation::Legislation::ProposalsController < Moderation::BaseController
+  include ModerateActions
+  include FeatureFlags
+
+  has_filters %w[pending_flag_review all with_ignored_flag], only: :index
+  has_orders %w[flags created_at], only: :index
+
+  feature_flag :legislation
+
+  before_action :load_resources, only: [:index, :moderate]
+
+  load_and_authorize_resource class: "Legislation::Proposal"
+
+  private
+
+    def resource_model
+      Legislation::Proposal
+    end
+end