feat: adds requirements and settings for the redis event bus

[pomegranited]

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[bmtcril]

Thanks for this, and reminding me that this repo exists. 😬 I'm hoping we can move this repo to encapsulate both Kafka and redis backends, so am doing investigation for that work in #5 . I'm going to roll this awesome work into that for now and we'll see which way it goes.

[pomegranited]

Thanks @bmtcril ! I'll close this PR then.

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