shouldRetry property for slots

[howlowck]

Is your feature request related to a problem? Please describe.
Dev should be able to define a function that based on turn count or existing wolf state, whether wolf needs to run the retry function if a response is invalid.

This is helpful if Dev wants the only retry 3 times, and go to another slot.

Describe the solution you'd like

Describe alternatives you've considered
We could the logic in the retryQuery function but it feels dirty.

Additional context

[howlowck]

If a user says a invalid slot and after the validate function, the shouldRetry function should run and determine if it should retry again or simply cancel.

The example we used during discussion is a "number guessing" game where the max number of "retries" is 5.