How to access Util Library functions via REST independent of transaction

Summary:

We are trying to create a REST API endpoint that will allow one of our external ERP systems to generate data based on a function that exists in CPQ. For example we have a custom MBL Util Library that is used to calculate pricing and costing given certain input parameters. The library function relies on communicating with data tables and extracting information within CPQ. In the past we have done many integrations within an existing transaction using actions and making the request through REST API. This time we would like a more independent function that will allow external services to