Cancel key will cancel all Effect Even with Different Store

[jeffersonsetiawan]

It's because the Effect cancellation is stored in the global internal var cancellationCancellables: [AnyHashable: Set<AnyDisposable>]

Discussed on this PR discussion

Tokopedia is using separate Store for every page/feature, so problem will happen in the future.

[ivanbagaskara]

will pick this up after finishing these two:

• Improve performance of type-safe effect cancel token lookup #27
• Don't consider an effect in-flight till it's kicked off #29