BREAKING(cli/unstable): make ProgressBar value and max properties public

[timreichen]

Ref: #6408 (comment)

This PR makes the ProgressBar value and max properties public.
This is more flexible as the progress bar max can be adjusted after instantiation and allows to set the value directly (progressBar.value = newValue) instead of only adding increments.
This makes the add() method obsolete as the same can be achieved with progressBar.value += x.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.01%. Comparing base (71c828a) to head (4718c7c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6430      +/-   ##
==========================================
+ Coverage   95.98%   96.01%   +0.03%     
==========================================
  Files         564      564              
  Lines       42482    42482              
  Branches     6394     6394              
==========================================
+ Hits        40775    40788      +13     
+ Misses       1668     1661       -7     
+ Partials       39       33       -6     

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