BREAKING(cli/unstable): replace ... more content indication with up and down arrows

[timreichen]

After trying the api, ... seems not too intuitive, nothing indicates if there is more content above.
This PR changes the more content indication ... to a ↓ arrow and additionally it indicates if moving up is possible with a ↑ arrow. It also adds indicator and visibleLines properties to promptMultipleSelect().

What country are you from?
❯ Brazil
  United States
  Japan
  ↓

...

What country are you from?
  ↑
  United States
  Japan
❯ China
  ↓

...

What country are you from?
  ↑
  China
  Canada
❯ Spain

[codecov]

Codecov Report

Attention: Patch coverage is 96.80851% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.69%. Comparing base (3d44532) to head (bb2dc8b).

Files with missing lines	Patch %	Lines
cli/unstable_prompt_multiple_select.ts	95.65%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6699      +/-   ##
==========================================
- Coverage   94.70%   94.69%   -0.02%     
==========================================
  Files         567      567              
  Lines       46793    46862      +69     
  Branches     6582     6595      +13     
==========================================
+ Hits        44315    44375      +60     
- Misses       2436     2445       +9     
  Partials       42       42              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.