Implement Poker Practice Exercise

[thibault2705]

This PR implements the ticket New Exercise ✨: Poker #485.

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[SleeplessByte]

@thibault2705 there seem to be some issues.

1. The title of two tests being the same (please check tests.toml)
2. The type; adding a return type to the bestHands function may resolve it. It's okay to use the correct type -- there is no real surprise or learning goal for the return type.

[thibault2705]

Hi @SleeplessByte, thanks for your review. I fixed the following points in my latest commit 8f4b306:

1. According to tests.toml, I removed the unused test case in poker.test.ts
2. Return type string[] added to the bestHands method.

[SleeplessByte]

/format

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The "Format code" action has started running.

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The "Format code" action has finished running.

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For security reasons, /format does not trigger CI builds when the PR has been submitted from a fork. If checks were not passing due to code format, trigger a build to make the required checks pass, through one of the following ways:

• Push an empty commit to this branch: git commit --allow-empty -m "Trigger builds".
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[SleeplessByte]

The typechecks are still failing. I'll try to find out why when i get a minute!