feat(commands): Add delete_unchanged option to forget

[aawsome]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 42.4%. Comparing base (fe2a9bd) to head (d3982cf).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/commands/forget.rs	33.3%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/core/src/commands/forget.rs	85.0% <33.3%> (-1.5%)	⬇️

... and 12 files with indirect coverage changes