BREAKING(cli/unstable): rename fmt to formatter

[timreichen]

This PR replaces fmt to formatter because property abbreviations should be avoided as they are uncommon in web apis.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.65%. Comparing base (0ad72c3) to head (cfcc537).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6707      +/-   ##
==========================================
- Coverage   94.65%   94.65%   -0.01%     
==========================================
  Files         576      576              
  Lines       47060    47060              
  Branches     6608     6608              
==========================================
- Hits        44545    44544       -1     
- Misses       2473     2474       +1     
  Partials       42       42              

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