Add PermissionSet, RolePermission models & seeds

This is building off of the new migrations in
solidusio#5833

These originate from `solidus_user_roles`. We intend to migrate some of
the functionality from that extension into `core`, and this is the
(second) step.

core/app/models/spree/permission_set.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Spree
+  class PermissionSet < Spree::Base
+    has_many :role_permissions
+    has_many :roles, through: :role_permissions
+    validates :name, :set, presence: true
+    scope :display_permissions, -> { where('name LIKE ?', '%Display') }
+    scope :management_permissions, -> { where('name LIKE ?', '%Management') }
+  end
+end

core/app/models/spree/role.rb

@@ -4,6 +4,8 @@ module Spree
   class Role < Spree::Base
     has_many :role_users, class_name: "Spree::RoleUser", dependent: :destroy
     has_many :users, through: :role_users
+    has_many :role_permissions, dependent: :destroy
+    has_many :permission_sets, through: :role_permissions
 
     validates :name, presence: true, uniqueness: { case_sensitive: true, allow_blank: true }
 

core/app/models/spree/role_permission.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Spree
+  class RolePermission < Spree::Base
+    belongs_to :role
+    belongs_to :permission_set
+  end
+end

core/db/default/spree/permission_sets.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+Spree::PermissionSets::Base.subclasses.each do |permission|
+  Spree::PermissionSet.create(name: permission.to_s.split('PermissionSets::').last, set: permission.to_s)
+end

core/db/seeds.rb

@@ -13,6 +13,7 @@
   zones
   refund_reasons
   roles
+  permission_sets
   shipping_categories
 ).each do |seed|
   shell.say_status :seed, seed