Feat/model backed ui (#1145)

This is an initial PR for a new model-driven UI where extensions can provide definitions of the components & how they're laid out using Containers.
#1140, #1141, #1142, #1143 and #1144 are all tracking additional work needed to improve the initial implementation and fix some issues with the implementation.

Features:
- Supports defining a FlexContainer that maps to a flexbox-based layout.
- Supports creating a card component, which is a key-value pair based control that will lay out simple information to a user. Eventually this will have an optional set of actions associated with it.
- Has a sample project which shows how to use the API and was used for verification

src/sql/parts/dashboard/widgets/insights/insightsWidget.component.ts

@@ -204,6 +204,8 @@ export class InsightsWidget extends DashboardWidget implements IDashboardWidget,
 		}
 		componentInstance.data = { columns: result.columnInfo.map(item => item.columnName), rows: result.rows.map(row => row.map(item => item.displayValue)) };
 
+		componentInstance.data = { columns: result.columnInfo.map(item => item.columnName), rows: result.rows.map(row => row.map(item => item.displayValue)) };
+
 		if (componentInstance.init) {
 			componentInstance.init();
 		}