Adding caching to execution plan and refactoring code and some other fixes (#18913)

* Making ep code modular for easy swithcing in and out

* Changing to innerText

* Fixing renames

* Fixing var name in one file

src/sql/workbench/common/editor/query/executionPlanState.ts

@@ -5,9 +5,20 @@
 
 import type * as azdata from 'azdata';
 
+/**
+ * This class holds the view and the graphs of the execution plans
+ *  displayed in the results tab of a query editor
+ */
 export class ExecutionPlanState {
-	graphs: azdata.executionPlan.ExecutionPlanGraph[] = [];
-	clearExecutionPlanState() {
-		this.graphs = [];
+
+	private _graphs: azdata.executionPlan.ExecutionPlanGraph[] = [];
+	public executionPlanFileViewUUID: string;
+
+	public get graphs(): azdata.executionPlan.ExecutionPlanGraph[] {
+		return this._graphs;
+	}
+
+	public set graphs(v: azdata.executionPlan.ExecutionPlanGraph[]) {
+		this._graphs = v;
 	}
 }

src/sql/workbench/common/editor/query/queryResultsInput.ts

@@ -29,7 +29,6 @@ export class ResultsViewState {
 		this.gridPanelState.dispose();
 		this.chartState.dispose();
 		this.queryPlanState.dispose();
-		this.executionPlanState.clearExecutionPlanState();
 		this.dynamicModelViewTabsState.forEach((state: QueryModelViewState, identifier: string) => {
 			state.dispose();
 		});