feat(cli/unstable): add `promptSelect()`

[timreichen]

Ref: https://github.com/denoland/std/issues/4678

Changes Adds promptSelect() cli function.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.56%. Comparing base (93e0cd6) to head (ef0a93d). Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cli/unstable_prompt_select.ts	92.15%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6190 +/- ## ======================================= Coverage 96.56% 96.56% ======================================= Files 532 533 +1 Lines 40819 40870 +51 Branches 6111 6122 +11 ======================================= + Hits 39416 39467 +51 - Misses 1360 1361 +1 + Partials 43 42 -1 ```

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[kt3k]

• Can you rename the file to unstable_prompt_select.ts as we want to accept every new feature as unstable feature? ref: https://github.com/denoland/std/blob/main/.github/CONTRIBUTING.md#new-features-in-stable-packages-version--100
• Can you try to write test cases by spying/stubing methods of Deno.stdin and Deno.stdout? Mocking utilities are available from @std/testing/mock

[timreichen]

• Can you rename the file to unstable_prompt_select.ts as we want to accept every new feature as unstable feature? ref: https://github.com/denoland/std/blob/main/.github/CONTRIBUTING.md#new-features-in-stable-packages-version--100
• Can you try to write test cases by spying/stubing methods of Deno.stdin and Deno.stdout? Mocking utilities are available from @std/testing/mock

I've added some tests but need help resolving the current errors. The tests ran successfully locally. I don't know, why they occur and how to fix them.

[kt3k]

The tests ran successfully locally. I don't know, why they occur and how to fix them.

I think you also need to stub Deno.stdin.setRaw (with empty function) to avoid error. (The error in CI seems happening because the stdin is not terminal in CI)

[Kacaii]

Im really excited for this one! Its exactly what I've been looking for! <3