Update Order model in openmrs-module-emrapi with accessionNumber

We have a use case to store accessionNumber for the orders but the order class in EncounterTransaction file isn’t having accessionNumber field. Can this be updated?

PR for same - BAH-3448 | Add. Accession number field in Order class by riyaTw · Pull Request #219 · openmrs/openmrs-module-emrapi · GitHub @dkayiwa can you please review it