Feature - Import & Export

[nkaaf]

Implement the new Import and Export Feature of the storage/configuration file of git-profiles. This allows easier multi-system management of git profiles.
During the import procedure, a forced overwrite can be configured. Otherwise it will merge the configurations. If merge conflicts occurs, they will be printed.

Add and fix the docstring of every module

[codecov-commenter]

Codecov Report

❌ Patch coverage is 30.15873% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.83%. Comparing base (0f54763) to head (f9995e3).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/git_profiles/storage.py	25.80%	23 Missing ⚠️
src/git_profiles/cli.py	34.37%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   63.63%   56.83%   -6.81%     
==========================================
  Files           6        6              
  Lines         264      322      +58     
==========================================
+ Hits          168      183      +15     
- Misses         96      139      +43     

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