DEV: Move more service code to core (#26613)

This is to enable :array type attributes for Contract
attributes in services, this is a followup to the move
of services from chat to core here:

cab178a40557e205e9c3e75fcb411a5e0e164d15

Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>

plugins/chat/lib/chat/types/array.rb

@@ -1,32 +0,0 @@
-# frozen_string_literal: true
-
-module Chat
-  module Types
-    class Array < ActiveModel::Type::Value
-      def serializable?(_)
-        false
-      end
-
-      def cast_value(value)
-        case value
-        when String
-          value.split(",")
-        when ::Array
-          value.map { |item| convert_to_integer(item) }
-        else
-          ::Array.wrap(value)
-        end
-      end
-
-      private
-
-      def convert_to_integer(item)
-        Integer(item)
-      rescue ArgumentError
-        item
-      end
-    end
-  end
-end
-
-ActiveSupport.on_load(:active_record) { ActiveModel::Type.register(:array, Chat::Types::Array) }