Automatic reconnect option

[nmaas87]

It would be awesome to have an automatic reconnect option in the Python API, so that it can automatically reconnect if it loses connection, e.g. when someone restarts the Yamcs Server for an MDB update or debugging.

[nmaas87]

This should also entail automatic re-subscription to parameters, etc

[fqqb]

Published an example on how to do parameter subscription combined with reconnection: https://docs.yamcs.org/python-yamcs-client/examples/reconnection/

The issue asks for a built-in option (for example a ParameterSubscription object which can automatically restore), which I'm not against, but is still a few steps away (1/ auth sessions are not restored when Yamcs restarts. 2/ maybe better to use a shared WebSocket for all subscriptions). The example shows how to achieve reconnection by manually tracking the lifetime of a single subscription and recreating the client entirely.