feat(@schematics/angular): add prompt to strict mode

Author: alan-agius4

packages/schematics/angular/ng-new/schema.json

@@ -130,6 +130,7 @@
     },
     "strict": {
       "description": "Creates a workspace with stricter type checking and stricter bundle budgets settings.",
+      "x-prompt": "Create a workspace with stricter type checking and stricter bundle budgets settings? [https://angular.io/guide/strict-mode]",
       "type": "boolean",
       "default": false,
       "x-user-analytics": 7