feat(db): support using postgresql service connection file Add new service rdbms config option to set the service name to be used with a postgresql service connection file. This can be done using the PGSERVICE environment variable for a single instance tracker server. For a multi-instance server this per-tracker config option is needed. Note that settings (host, user, (db)name...) in config.ini file will override the service connection file setting. Also setting PGSERVICE and service will use the service setting.