Alternative Check field associated entity and add missing fields

[bvkimball]

An alternative approach to parsing missing fields. Lots to discuss but check test cases to see approach:

      const meta: MetaService = new MetaService('EarnCodeGroup');
      const associatedEntity = { fields: [{ name: 'id' }] };
      meta.memory = {
        id: { name: 'id' },
        candidate: { name: 'candidate', associatedEntity },
        jobOrder: { name: 'jobOrder', associatedEntity },
      };
      const fields = ['id', 'payRate', 'candidate(id,name,address)', 'jobOrder(id,status,title)'];
      const res = meta.missing(fields);
      expect(res[0]).toBe('payRate');
      expect(res[1]).toBe('candidate(name,address)');
      expect(res[2]).toBe('jobOrder(status,title)');