chore(Firestore) add changeset for PR #8926 (#9115)

Add the missing changset for PR #8926.

Author: DellaBitta

.changeset/moody-comics-speak.md

@@ -0,0 +1,8 @@
+---
+'@firebase/firestore': minor
+'firebase': minor
+---
+
+Added support for Firestore result types to be serialized with `toJSON` and then deserialized with `fromJSON` methods on the objects.
+
+Addeed support to resume `onSnapshot` listeners in the CSR phase based on serialized `DataSnapshot`s and `QuerySnapshot`s built in the SSR phase.