Using arviz 1.0

[williambdean]

Any steps that we will have to take on our side? Or does this come along for the ride? Likely type hints, etc

Reference: pymc-devs/pymc#8019

[williambdean]

This will touch various places

https://github.com/search?q=repo%3Apymc-labs%2Fpymc-marketing%20InferenceData&type=code