feat: add lockable setting

Author: zernie

app/models/spree/user.rb

@@ -8,6 +8,7 @@ class User < Spree::Base
            :rememberable, :trackable, :validatable, :encryptable
     devise :confirmable if Spree::Auth::Config[:confirmable]
     devise :omniauthable, omniauth_providers: Spree::Auth::Config[:omniauthable] if Spree::Auth::Config[:omniauthable].present?
+    devise :lockable if Spree::Auth::Config[:lockable].present?
 
     if defined?(Spree::SoftDeletable)
       include Spree::SoftDeletable

lib/spree/auth_configuration.rb

@@ -5,6 +5,7 @@ class AuthConfiguration < Preferences::Configuration
     preference :registration_step, :boolean, default: true
     preference :signout_after_password_change, :boolean, default: true
     preference :confirmable, :boolean, default: false
+    preference :lockable, :boolean, default: false
     preference :omniauthable_providers, :array, default: []
     preference :draw_frontend_routes, :boolean, default: true
     preference :draw_backend_routes, :boolean, default: true