[Merged by Bors] - feat: add evalPowZeroInt positivity extension #1196
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Adds a new positivity extension to handle integer exponents of value 0. Corresponds to [this piece of logic](https://github.com/leanprover-community/mathlib/blob/09258fb7f75d741b7eda9fa18d5c869e2135d9f1/src/tactic/positivity.lean#L582-L584) in mathlib3. This lets us uncomment another test case.
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Adds a new positivity extension to handle integer exponents of value 0.
Corresponds to this piece of logic in mathlib3.
This lets us uncomment another test case.