Revert lazy-loaded AR, turns out to be more complex

Needs another take, this one was too simplistic.

      NameError: uninitialized constant RubyEventStore::ActiveRecord::WithDefaultModels::EventInStream (NameError)

            [Event, EventInStream]
                    ^^^^^^^^^^^^^

Related:
#1906

Author: mostlyobvious

ruby_event_store-active_record/lib/ruby_event_store/active_record.rb

@@ -15,9 +15,6 @@
 require_relative "active_record/index_violation_detector"
 require_relative "active_record/pg_linearized_event_repository"
 require_relative "active_record/version"
-if defined?(Rails::Engine)
-  require_relative "active_record/railtie"
-else
-  require_relative "active_record/skip_json_serialization"
-  require_relative "active_record/event"
-end
+require_relative "active_record/skip_json_serialization"
+require_relative "active_record/event"
+require_relative "active_record/railtie" if defined?(Rails::Engine)

ruby_event_store-active_record/lib/ruby_event_store/active_record/railtie.rb

@@ -3,12 +3,6 @@
 module RubyEventStore
   module ActiveRecord
     class Railtie < ::Rails::Railtie
-      initializer "ruby_event_store-active_record" do
-        ActiveSupport.on_load(:active_record) do
-          require_relative "../active_record/skip_json_serialization"
-          require_relative "../active_record/event"
-        end
-      end
     end
   end
 end