feat(core)!: remove hierarchy config

[bowheart]

Description

Remove the Store class's hierarchyConfig static property. This is a breaking change, but likely won't affect any Zedux users since we left this feature undocumented, intending to remove it.

The hierarchy config allowed stores to use different hierarchical data structures besides the default JS object. Zedux would then be able to intelligently merge nested reducers and stores together in e.g. an Immutable Map. Its setStateDeep would also use the hierarchyConfig

In practice, this is never used. Reducers are almost never used in Zedux and there's no point to using Immutable JS to wrap a simple child store mapping. It's easy to create an ImmutableJS zero-config store by setting that as the value and using setState on that value directly, ignoring setStateDeep.

If deeper functionality is needed, users are still able to extend the Store class (another undocumented feature) and modify absolutely everything. While that's more involved, it's probably necessary anyway - as it is, hierarchyConfig doesn't work intuitively for nested stores. Expanding Zedux's current hierarchyConfig model to cover all use cases would not be simple, would add codebase bloat, and would still never be used. Most importantly it would be redundant - since extending the Store class is already possible, we should make it the only way to add rarely-needed functionality like this.

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