cdrs-tokio test suite integration

[conorbros]

No description provided.

[conorbros]

Not ready for review yet, just trying to get the CI to run so I can check it's working.

[benbromhead]

This seems stuck, are we pursuing this (or a todo later)?

[conorbros]

This PR enables us to run cdrs-tokio for our Cassandra integration tests. The cpp driver is hidden behind a feature that will also run if the feature is enabled. rstest is used to define what tests we want to run each driver for.

There is still some problems running cdrs-tokio on all the tests:

• I will need to get a fix upstreamed to cdrs-tokio to re-enable the collections tests (Add set type functions krojew/cdrs-tokio#103).
• Many of the tests don't work with cdrs-tokio, still need to investigate the reasons for all of these. They have been marked with TODOs

I need to re-enable the collections test before this can be merged.

After that, need to decide whether to:

• Only merge once cdrs-tokio runs on all the tests.
• Merge as is and follow up on problems in later PRs.

I'm leaning towards merging once cdrs-tokio passes on all the tests.

Getting all the setup code for adding new drivers in could be useful though, for example the scylla driver could also be added.

[rukai]

I'm leaning towards merging once cdrs-tokio passes on all the tests.

As long as we have integration test cases running on at least the cassandra_cpp driver and we are happy with the multi-driver abstraction then I am happy to merge.

[rukai]

The test run time has halved from 40m -> 20m, I think a bunch of tests are no longer running.

[conorbros]

Fixed the issue with it missing some tests, review can continue now.

[rukai]

I think we might end up removing the rstest approach later on so that we can reuse Cassandra clusters between tests that have identical Cassandra setups.

The rstest approach is fine for now though, let's land this and iterate further in main.