Add branches to push subcommand

[SandrineP]

Fix #98
Add <branch> and --branches flag to push subcommand.

[codecov]

Codecov Report

❌ Patch coverage is 53.06122% with 46 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.04%. Comparing base (f2e1dfb) to head (d1bf381).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/subcommand/push_subcommand.cpp	46.37%	37 Missing ⚠️
src/wrapper/repository_wrapper.cpp	70.00%	6 Missing ⚠️
src/utils/progress.cpp	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   88.27%   86.04%   -2.24%     
==========================================
  Files          61       61              
  Lines        2627     2708      +81     
  Branches      309      323      +14     
==========================================
+ Hits         2319     2330      +11     
- Misses        308      378      +70     

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