Lack of methods to retrieve auxiliary data tables in standalone client code

Currently, we have methods to write auxiliary tables into the SQLite file in standalone code, through the use of the GeoModelIO publisher.

And we have ways to retrieve those auxiliary data from within the ATLAS framework Athena, through the use of the IRDBAccessSvc interface.

However, we don't have code to retrieve those auxiliary data custom tables from a piece of standalone client code.

We also need an example to document how to retrieve custom tables.