Implement stash show

[SandrineP]

Fix #83
Implement stash show

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.37%. Comparing base (c460fce) to head (9aceba2).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wrapper/repository_wrapper.cpp	50.00%	2 Missing ⚠️
src/subcommand/diff_subcommand.cpp	92.30%	1 Missing ⚠️
src/subcommand/stash_subcommand.cpp	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   86.18%   86.37%   +0.18%     
==========================================
  Files          60       60              
  Lines        2186     2253      +67     
  Branches      244      254      +10     
==========================================
+ Hits         1884     1946      +62     
- Misses        302      307       +5     

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