examples: update connect and disconnect scenario by using a timer

[DavidVujic]

Description

Updated the examples section, on how to handle connection issues with a ZooKeeper server.

Motivation and Context

Originates from #327

How Has This Been Tested?

1. running a ZooKeeper server in podman/docker
2. Starting the client, making sure it is connected
3. disable the podman/docker network
4. verify that the client has lost connection.
5. reconnect the network.

The steps above have been made within the timeout period, to confirm the client is reconnecting, and longer than the timeout to confirm the client is exiting.

Also, starting up a client with an already disabled network, making sure it connects when the network is up and running again.

Example:

docker run --rm -p 2181:2181 zookeeper

node examples/index.js

docker network disconnect <network id/name> <container id>

docker network connect <network id/name> <container id>

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] I have read the code of conduct.
• [ ] I have read the contributing guide.
• [ ] I have updated the documentation accordingly (if applicable).