Subscription reconnection does not work if a Topic instance is used for both publication and subscrtiption

[daisukes]

Description
Re-connection of subscription of a Topic instance does not work if the instance is also used for publication.

To Reproduce
Reproduction code
https://github.com/daisukes/rosbridge-bug/blob/main/bridge/test_ng.py

1. connect
2. make a Topic
3. subscribe to the Topic
4. publish to the Topic as well
5. reconnect

Expected behavior

subscription to the Topic is connected automatically

Note
https://github.com/gramaziokohler/roslibpy/blob/82442226d8b20f132a07dba7ced285945ce1c238/src/roslibpy/core.py#L300
self._connect_message is shared by publish/subscribe, so re-connection may not work as expected