Sample Gauge Project illustrating table driven scenario.

Refer to this Pull Request for change details

Refer to this issue for context on why we need this feature.

• this example illustrates the execution of a scenario against a datatable defined in a scenario.
• this feature is marked experimental, and needs to be toggled on by setting allow_scenario_datatable=true as an environment variable.
• in this project allow_scenario_datatable=true is set in env/default/default.properties
• note 1 that external scenario is not supported.
• note 2 no plugins support this, so reports and IDE plugins will not support this feature.