Repro: cln-plugin cannot subscribe to wildcard "*"

This test reproduces a bug in the `cln-plugin`-crate.
Core Lightning supports a wildcard `*` that plugins can use to
subscribe to all notifications.

However, `cln-plugin` does not support this case.
It allows the developer to subscribe `*`.
But the plug-in crashes when the first notification is received

tests/test_cln_rs.py

@@ -382,3 +382,15 @@ def test_grpc_decode(node_factory):
         string=inv.bolt11
     ))
     print(res)
+
+
+def test_rust_plugin_subscribe_wildcard(node_factory):
+    """ Creates a plugin that loads the subscribe_wildcard plugin
+    """
+    bin_path = Path.cwd() / "target" / RUST_PROFILE / "examples" / "cln-subscribe-wildcard"
+    l1 = node_factory.get_node(options={"plugin": bin_path})
+    l2 = node_factory.get_node()
+
+    l2.connect(l1)
+
+    l1.daemon.wait_for_log("Received notification connect")