[Feature] Email collect message hooks (#331)

- Add email collect hook on creating conversation
- Merge contact if it already exist

app/models/channel/facebook_page.rb

@@ -17,31 +17,29 @@
 #  index_channel_facebook_pages_on_page_id_and_account_id  (page_id,account_id) UNIQUE
 #
 
-module Channel
-  class FacebookPage < ApplicationRecord
-    include Avatarable
+class Channel::FacebookPage < ApplicationRecord
+  include Avatarable
 
-    self.table_name = 'channel_facebook_pages'
+  self.table_name = 'channel_facebook_pages'
 
-    validates :account_id, presence: true
-    validates :page_id, uniqueness: { scope: :account_id }
-    has_one_attached :avatar
-    belongs_to :account
+  validates :account_id, presence: true
+  validates :page_id, uniqueness: { scope: :account_id }
+  has_one_attached :avatar
+  belongs_to :account
 
-    has_one :inbox, as: :channel, dependent: :destroy
+  has_one :inbox, as: :channel, dependent: :destroy
 
-    before_destroy :unsubscribe
+  before_destroy :unsubscribe
 
-    def name
-      'Facebook'
-    end
+  def name
+    'Facebook'
+  end
 
-    private
+  private
 
-    def unsubscribe
-      Facebook::Messenger::Subscriptions.unsubscribe(access_token: page_access_token)
-    rescue => e
-      true
-    end
+  def unsubscribe
+    Facebook::Messenger::Subscriptions.unsubscribe(access_token: page_access_token)
+  rescue => e
+    true
   end
 end