[WEB-1682] refactor: editor code splitting (#4893)

* refactor: lite and rich text editors

* refactor: document editor migration

* fix: add missing css import

* refactor: issue embed widget splitting

* chore: remove extensions folder from ee

* chore: update web ee folder structure

* fix: build errors

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Co-authored-by: Satish Gandham <satish.iitg@gmail.com>

web/app/[workspaceSlug]/(projects)/projects/(detail)/[projectId]/pages/(detail)/[pageId]/page.tsx

@@ -6,7 +6,7 @@ import Link from "next/link";
 import { useParams } from "next/navigation";
 import useSWR from "swr";
 // document-editor
-import { EditorRefApi, useEditorMarkings } from "@plane/document-editor";
+import { EditorRefApi, useEditorMarkings } from "@plane/editor";
 // types
 import { TPage } from "@plane/types";
 // ui