Migrate Fineract ORM from OpenJPA to EclipseLink

In line with the rationale for choosing EclipseLink as the ORM replacement for Hibernate in FineractCN, we have broad consensus across the community to swap out OpenJPA with EclipseLink. OpenJPA seems to have reached its end of life with community activity withering and the trade-offs between Hibernate and EclipseLink are much lower. We also have community members who are migrating Fineract 1.x to PostGreSQL and would benefit from the increased performance with EclipseLink.