Multi node tests in CI

[cvybhu]

We should add some tests that use a cluster of multiple nodes.
For example:

• Make a cluster of 3 scylla nodes
• Make one node unreachable from the driver (drop all packets from driver to this node)
• run cargo test

This would prevent bugs like: #306

It looks like java-driver uses ccm to run tests in their CI, we could do something similar.
https://github.com/scylladb/java-driver/blob/scylla-3.x/.github/workflows/tests.yml#L26

[Jasperav]

is ccm required? I guess a simple docker compose file, mention in #306, would also work. When a node is added to the cluster while this driver is running in an application, does this driver adds the new node in memory? Maybe that can be tested as well while fixing this issue

[piodul]

In #489, we modified the CI to run tests on a 3-node cluster. We can additionally consider tests which will modify the cluster while they are running to tests how the driver behaves when the topology changes.

[Lorak-mmk]

Closing in favor of #1097