Add --find-renames and --find-copies to the diff command

[SandrineP]

Fix #88
Add --find-renames and --find-copies to the diff command

[codecov]

Codecov Report

❌ Patch coverage is 90.19608% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.04%. Comparing base (054814f) to head (c3b5ce4).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/subcommand/diff_subcommand.cpp	90.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   86.83%   87.04%   +0.21%     
==========================================
  Files          60       60              
  Lines        2340     2386      +46     
  Branches      276      289      +13     
==========================================
+ Hits         2032     2077      +45     
- Misses        308      309       +1     

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