python-client: fix test.py for current rpc_reader and PluginRemote APIs (#2087)

test.py has drifted from the server code it exercises: RpcTransport
implementations must provide writeSerialized (rpc.py no longer calls
writeJSON), and PluginRemote.__init__ now takes a ClusterSetup as its
first argument instead of the peer. Verified against a live scrypted
server (connects and enumerates devices).

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/python-client/test.py

@@ -52,7 +52,7 @@ class EioRpcTransport(rpc_reader.RpcTransport):
 
         asyncio.run_coroutine_threadsafe(send(), self.loop)
 
-    def writeJSON(self, json, reject):
+    def writeSerialized(self, json, reject):
         return self.writeBuffer(json, reject)
 
 
@@ -96,8 +96,9 @@ async def connect_scrypted_client(
         peer.params["print"] = print
 
         def callback(api, pluginId, hostInfo):
+            cluster_setup = plugin_remote.ClusterSetup(transport.loop, peer)
             remote = plugin_remote.PluginRemote(
-                peer, api, pluginId, hostInfo, transport.loop
+                cluster_setup, api, pluginId, hostInfo, transport.loop
             )
             wrapped = remote.setSystemState