Add setting to control the references code lens

package.json

@@ -609,6 +609,11 @@
           "default": true,
           "description": "Loads user and system-wide PowerShell profiles (profile.ps1 and Microsoft.VSCode_profile.ps1) into the PowerShell session. This affects IntelliSense and interactive script execution, but it does not affect the debugger."
         },
+        "powershell.enableReferencesCodeLens": {
+          "type": "boolean",
+          "default": true,
+          "description": "Displays a code lens above function definitions showing the number of times the function is referenced in the workspace. Large workspaces should disable this setting due to high performance impact."
+        },
         "powershell.bugReporting.project": {
           "type": "string",
           "default": "https://github.com/PowerShell/vscode-powershell",

src/settings.ts

@@ -101,6 +101,7 @@ export interface ISettings {
     buttons?: IButtonSettings;
     cwd?: string;
     notebooks?: INotebooksSettings;
+    enableReferencesCodeLens?: boolean;
 }
 
 export interface IStartAsLoginShellSettings {
@@ -268,6 +269,8 @@ export function load(): ISettings {
             configuration.get<IStartAsLoginShellSettings>("startAsLoginShell", defaultStartAsLoginShellSettings),
         cwd: // NOTE: This must be validated at startup via `validateCwdSetting()`. There's probably a better way to do this.
             configuration.get<string>("cwd", undefined),
+        enableReferencesCodeLens:
+            configuration.get<boolean>("enableReferencesCodeLens", true),
     };
 }