[v3] Add hypothesis test hooks

[jhamman]

Zarr will really benefit from some highly-parameterized stateful testing. @dcherian has been doing quite a bit of this work lately and could likely offer some ideas for impactful hypothesis strategies here.

xref: #1746

[jhamman]

We now have hypothesis tests in the v3 branch for the store and array interfaces (thanks @dcherian and @e-marshall)! More can be added later but I'm going to close this for now.