refactor(cli/unstable): Declare ProgressBar options as separate properties

[timreichen]

Ref: #6408 (comment)

This PR removes ProgressBar #options property in favour of separate private properties.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.04%. Comparing base (360851f) to head (81e6935).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6433   +/-   ##
=======================================
  Coverage   96.03%   96.04%           
=======================================
  Files         562      562           
  Lines       42418    42431   +13     
  Branches     6387     6385    -2     
=======================================
+ Hits        40738    40754   +16     
+ Misses       1641     1638    -3     
  Partials       39       39           

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[kt3k]

What is resolved by this change? I can't correlate this change with the linked comment

[timreichen]

What is resolved by this change? I can't correlate this change with the linked comment

This paves the way for PRs that make some props like max public.
Also, wrapping these props in an object is not necessary in general because the object is not used or passed anywhere.

[BlackAsLight]

I think it would make more sense for the pull request to actually be apart of the other one where value is exposed?

[timreichen]

Closing in favour of #6430