[WIKI-458] refactor: base page instance for additional properties (#7228)

* refactor: create a super class for base page

* fix: path

---------

Co-authored-by: Palanikannan M <akashmalinimurugu@gmail.com>

web/ce/store/pages/extended-base-page.ts

@@ -0,0 +1,16 @@
+import { TPage, TPageExtended } from "@plane/types";
+import { RootStore } from "@/plane-web/store/root.store";
+import { TBasePageServices } from "@/store/pages/base-page";
+
+export type TExtendedPageInstance = TPageExtended & {
+  asJSONExtended: TPageExtended;
+};
+
+export class ExtendedBasePage implements TExtendedPageInstance {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  constructor(store: RootStore, page: TPage, services: TBasePageServices) {}
+
+  get asJSONExtended(): TExtendedPageInstance["asJSONExtended"] {
+    return {};
+  }
+}