Query Execution Plan Expensive Operator Highlighting (#20579)

* Boilerplate for new context menu options

* Enables checkmarks for expensive operator context menu actions

* Updates azdataGraph version to 0.0.44

* Adds clearing logic to actions and retrieves additional info from nodes

* Removes unnecessary actions that aren't supported by other providers

* Finishes setting up the rest of the context menu actions

* Corrects context menu action label

* Defines new widget type for finding expensive operations

* Adds TODO for class icon name

* Creates action to open the expensive operation widget

* Adds escape and enter key shortcuts to findExpensiveOperation widget

* Styles find expensive operation widget

* Corrects class name for finding expensive operator action

* Corrects import statement.

* Code clean up

* Bumps azdataGraph version to 0.0.45

* Adds an info box for when a metric doesn't find any nodes

* Adds label to find expensive operator widget

* Invokes dispose when widget controller removes widget

* Implements disposable in all execution plan widgets.

* Adds off action to clear highlighting

* Adds a default setting and default prompt for highlighting metric

* Fixes not all code paths return error

* Removes shortcut key from text for widget actions

* Adds enum description

* Removes added dictionary type, and renames class name

* Removes unnecessary null checks

* Removes cost metric dictionary and adds corresponding properties

* Code review changes

* Removes incorrectly implemented key down event for widget.

* Renames widget and action class names for highlighting expensive ops

* File rename

* Cleans up labels to better reflect highlight action

* Removes hardcoded button width style and sets it to auto

* More clean up

* Clean up import statement

* Code review changes

* Drop down list only shows available metrics

* Updates highlight expensive operation icon

* Update STS version

extensions/mssql/package.json

@@ -261,6 +261,29 @@
           "default": false,
           "description": "%mssql.intelliSense.lowerCaseSuggestions%"
         },
+        "mssql.executionPlan.expensiveOperationMetric": {
+          "type": "string",
+          "description": "%mssql.executionPlan.expensiveOperationMetric%",
+          "default": "cost",
+          "enum": [
+            "off",
+            "actualElapsedTime",
+            "actualElapsedCpuTime",
+            "cost",
+            "subtreeCost",
+            "actualNumberOfRowsForAllExecutions",
+            "numberOfRowsRead"
+          ],
+          "enumDescriptions": [
+            "%mssql.executionPlan.expensiveOperationMetric.off%",
+	          "%mssql.executionPlan.expensiveOperationMetric.actualElapsedTime%",
+	          "%mssql.executionPlan.expensiveOperationMetric.actualElapsedCpuTime%",
+	          "%mssql.executionPlan.cost%",
+	          "%mssql.executionPlan.subtreeCost%",
+	          "%mssql.executionPlan.actualNumberOfRowsForAllExecutions%",
+	          "%mssql.executionPlan.numberOfRowsRead%"
+          ]
+        },
         "mssql.query.rowCount": {
           "type": "number",
           "default": 0,