feat: add onStop to useCountdown hook

[samyarkd]

Every time I used useCountdown I had to set a timeout for when the count is stopped, it would much easier if we have this inside the hook, it would be much cleaner.

[changeset-bot]

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Latest commit: b8b91ae

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[samyarkd]

please let me know if I have to add jsDoc to the hook in case of approval.

[juliencrn]

Hi @samyarkd,
Thanks for that PR.
Yes, the JSDoc is more than welcome, and a unit-test too.
However, the PR does not compile yet.

[samyarkd]

added a unit test and modified the jsDocs 👍 also created a function to stop the countdown.

[samyarkd]

@juliencrn congratulations on the V3, i noticed there has been a couple changes in the hook so modified the changes according to the V3 so there are no conflicts