1. Check for nullptr if metadata is set. 2. Changing scaling_factor to be multiplied instead of divided (dcdb nomenclature).

SMUCNGPerf Operator: implementing memory bandwidth. PerSystSql Operator: fixing issue with one unit not being present, and no calculation was done.

- Hierarchical units are now supported across the framework in all plugins

- The configurator now accounts for hierarchical units
- Added checks in existing plugins to enforce flat/hierarchical units
- DISCLAIMER: this has likely broken the framework until I refactor OperatorTemplate