chore: Add feature flags for campaigns and website channel (#5778)

Co-authored-by: Tejaswini Chile <tejaswini@chatwoot.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

db/migrate/20221029202300_add_two_features_to_accounts.rb

@@ -0,0 +1,13 @@
+class AddTwoFeaturesToAccounts < ActiveRecord::Migration[6.1]
+  def change
+    Account.find_in_batches do |account_batch|
+      account_batch.each do |account|
+        account.enable_features(
+          'campaigns',
+          'channel_website'
+        )
+        account.save!
+      end
+    end
+  end
+end