DEV: Move discourse-chat to the core repo. (#18776)

As part of this move, we are also renaming `discourse-chat` to `chat`.

plugins/chat/lib/discourse_dev/direct_channel.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require "discourse_dev/record"
+require "faker"
+
+module DiscourseDev
+  class DirectChannel < Record
+    def initialize
+      super(::DirectMessageChannel, 5)
+    end
+
+    def data
+      if Faker::Boolean.boolean(true_ratio: 0.5)
+        admin_username =
+          begin
+            DiscourseDev::Config.new.config[:admin][:username]
+          rescue StandardError
+            nil
+          end
+        admin_user = ::User.find_by(username: admin_username) if admin_username
+      end
+
+      [User.new.create!, admin_user || User.new.create!]
+    end
+
+    def create!
+      users = data
+      Chat::DirectMessageChannelCreator.create!(acting_user: users[0], target_users: users)
+    end
+  end
+end