Move EmailValidator under Spree namespace

Change all usages of

    validates :email, email: true

to

    validates :email, 'spree/email' => true

core/app/models/spree/order.rb

@@ -129,7 +129,7 @@ def states
  before_create :link_by_email
 
  validates :email, presence: true, if: :require_email
- validates :email, email: true, allow_blank: true
+ validates :email, 'spree/email' => true, allow_blank: true
  validates :guest_token, presence: { allow_nil: true }
  validates :number, presence: true, uniqueness: { allow_blank: true }
  validates :store_id, presence: true

core/lib/spree/core/validators/email.rb

@@ -1,9 +1,30 @@
 # frozen_string_literal: true
 
-class EmailValidator < ActiveModel::EachValidator
- def validate_each(record, attribute, value)
- unless value =~ /\A([^@\.]|[^@\.]([^@\s]*)[^@\.])@([^@\s]+\.)+[^@\s]+\z/
- record.errors.add(attribute, :invalid, { value: value }.merge!(options))
+module Spree
+ # == An ActiveModel Email Validator
+ #
+ # === Usage
+ #
+ # require 'spree/core/validators/email'
+ #
+ # class Person < ApplicationRecord
+ # validates :email_address, 'spree/email' => true
+ # end
+ #
+ class EmailValidator < ActiveModel::EachValidator
+ EMAIL_REGEXP = /\A([^@\.]|[^@\.]([^@\s]*)[^@\.])@([^@\s]+\.)+[^@\s]+\z/
+
+ def validate_each(record, attribute, value)
+ unless value =~ EMAIL_REGEXP
+ record.errors.add(attribute, :invalid, { value: value }.merge!(options))
+ end
  end
  end
 end
+
+# @private
+EmailValidator = ActiveSupport::Deprecation::DeprecatedConstantProxy.new(
+ 'EmailValidator',
+ 'Spree::EmailValidator',
+ message: "EmailValidator is deprecated! Use Spree::EmailValidator instead.\nChange `validates :email, email: true` to `validates :email, 'spree/email' => true`\n"
+)

core/spec/lib/spree/core/validators/email_spec.rb

@@ -3,11 +3,11 @@
 require 'rails_helper'
 require 'spree/core/validators/email'
 
-RSpec.describe EmailValidator do
+RSpec.describe Spree::EmailValidator do
  class Tester
  include ActiveModel::Validations
  attr_accessor :email_address
- validates :email_address, email: true
+ validates :email_address, 'spree/email' => true
  end
 
  let(:valid_emails) {