DEV: move discourse_dev gem to the core. (#13360)

And get avatar images from `discourse_dev_assets` gem.

lib/discourse_dev/record.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require 'discourse_dev'
+require 'rails'
+require 'faker'
+
+module DiscourseDev
+  class Record
+    DEFAULT_COUNT = 30.freeze
+
+    attr_reader :model, :type
+
+    def initialize(model, count = DEFAULT_COUNT)
+      @@initialized ||= begin
+        Faker::Discourse.unique.clear
+        RateLimiter.disable
+        true
+      end
+
+      @model = model
+      @type = model.to_s
+      @count = count
+    end
+
+    def create!
+      record = model.create!(data)
+      yield(record) if block_given?
+    end
+
+    def populate!
+      if current_count >= @count
+        puts "Already have #{current_count} #{type.downcase} records"
+
+        Rake.application.top_level_tasks.each do |task_name|
+          Rake::Task[task_name].reenable
+        end
+
+        Rake::Task['dev:repopulate'].invoke
+        return
+      elsif current_count > 0
+        @count -= current_count
+        puts "There are #{current_count} #{type.downcase} records. Creating #{@count} more."
+      else
+        puts "Creating #{@count} sample #{type.downcase} records"
+      end
+
+      @count.times do
+        create!
+        putc "."
+      end
+
+      puts
+    end
+
+    def current_count
+      model.count
+    end
+
+    def self.populate!
+      self.new.populate!
+    end
+
+    def self.random(model)
+      offset = Faker::Number.between(from: 0, to: model.count - 1)
+      model.offset(offset).first
+    end
+  end
+end