Added/deleted-type websocket messages

Events are now sent for not only when an object changes but also when one is created or deleted.

For now it's not really possible to subscribe to these events however.

This breaks backwards-compatibility with the websocket messages.

pyproject.toml

@@ -58,6 +58,7 @@ ignore = [
     "D406",
     "D407",
     "FA100",
+    "FIX002",
     "S104",
     "TRY201",
     "TRY003",
@@ -66,6 +67,8 @@ ignore = [
     "DTZ003",
     "PLR0913",
     "SIM108",
+    "TD002",
+    "TD003",
 ]
 line-length = 120
 target-version = "py39"