feat: support appState.exportEmbedScene to embed scene data in exportToSvg util (#3777)

* feat: add embedScene attribute to exportToSvg util

* fix

* return promise

* add docs and remove

* fix

* fix tests

* use

* fix

* fix

* remove metadata and use exportEmbedScene

* fix

* fix

* fix

* fix

* IIFE

src/tests/packages/__snapshots__/utils.test.ts.snap

@@ -39,7 +39,6 @@ Object {
   "isResizing": false,
   "isRotating": false,
   "lastPointerDownWith": "mouse",
-  "metadata": undefined,
   "multiElement": null,
   "name": "name",
   "openMenu": null,