[MOD2-818] Add delete_reactions support for ban user (#229)

* feat: add delete_reactions support for ban user

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(test): simplify delete_reactions test to avoid async race

Reaction deletion happens asynchronously via a background task, so we
cannot assert on side-effects immediately. Verify the API accepts the
parameter instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: totalimmersion

stream_chat/tests/test_client.py

@@ -333,6 +333,17 @@ def test_shadow_ban(
     def test_ban_user(self, client: StreamChat, random_user, server_user: Dict):
         client.ban_user(random_user["id"], user_id=server_user["id"])
 
+    def test_ban_user_with_delete_reactions(
+        self, client: StreamChat, random_user, server_user: Dict
+    ):
+        # Reaction deletion happens asynchronously, so we only verify
+        # the API accepts the delete_reactions parameter
+        client.ban_user(
+            random_user["id"],
+            user_id=server_user["id"],
+            delete_reactions=True,
+        )
+
     def test_unban_user(self, client: StreamChat, random_user, server_user: Dict):
         client.ban_user(random_user["id"], user_id=server_user["id"])
         client.unban_user(random_user["id"], user_id=server_user["id"])