fix: add description for subcommands

[marcosdotme]

Description

Checklist

• [x] Add test cases to all the changes you introduce
• [x] Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• [x] Test the changes on the local machine manually
• [ ] Update the documentation for the changes (need remake a bunch of gifs/images @Lee-W)

Expected behavior

You must see the command description when running with --help option

Steps to Test This Pull Request

1. cz commit --help

Screenshot

[marcosdotme]

@Lee-W I delete the tests/commands/test_other_commands.py an move the tests for the correspondent file without asking you. Let me know if you need that I revert or squash this.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.54%. Comparing base (120d514) to head (5982338). Report is 319 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1120      +/-   ##
==========================================
+ Coverage   97.33%   97.54%   +0.20%     
==========================================
  Files          42       55      +13     
  Lines        2104     2486     +382     
==========================================
+ Hits         2048     2425     +377     
- Misses         56       61       +5     

Flag	Coverage Δ
unittests	97.54% <ø> (+0.20%)	:arrow_up:

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