feat(@angular/cli): update configuration schema with ivy i18n extraction support

Author: clydin

packages/angular/cli/lib/config/schema.json

@@ -1362,6 +1362,10 @@
               "description": "Specifies the source language of the application.",
               "x-deprecated": "Use 'i18n' project level sub-option 'sourceLocale' instead."
             },
+            "ivy": {
+              "type": "boolean",
+              "description": "Use Ivy compiler to extract translations."
+            },
             "progress": {
               "type": "boolean",
               "description": "Log progress to the console.",