end-to-end tests for ioredis and dragonfly

We already have pytests under tests/dragonfly.

I would like to add support for node-js tests. Specifically, start with ioredis tests.

Ideally, I would like to have the following deliverables:

1. A script that automates local pipeline run - i.e. starts dragonfly binary using DRAGONFLY_PATH environment path, checks out https://github.com/luin/ioredis predefined tag (v5.2.3 and runs tests according to https://github.com/luin/ioredis/blob/main/.github/workflows/test.yml#L29
2. a README.md that explains how to run the script and how to install the prerequisites. I do not know nodejs, so README should level with me :)
3. Bonus: our own nodejs test that runs against a running dragonfly process (can start/stop using DRAGONFLY_PATH) and uncovers a specific scenario. For example, PUB/SUB use-case reported in #382 .