refactor: subcommands

[cugu]

• Remove set-feature-flags and set-app-url subcommands
• Add --flags flag and --app-url flag

[codecov]

Codecov Report

Attention: Patch coverage is 61.29032% with 12 lines in your changes missing coverage. Please review.

Project coverage is 81.37%. Comparing base (38a89f2) to head (d4562cf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   81.20%   81.37%   +0.16%     
==========================================
  Files          35       35              
  Lines        1703     1697       -6     
==========================================
- Hits         1383     1381       -2     
+ Misses        320      316       -4