Support diffing stored or discovered current or goal states.

[azriel91]

Closes #133.

[codecov]

Codecov Report

Patch coverage: 94.89% and project coverage change: +0.03 🎉

Comparison is base (bae72ad) 90.72% compared to head (bfd6404) 90.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   90.72%   90.75%   +0.03%     
==========================================
  Files         344      345       +1     
  Lines       30770    31083     +313     
==========================================
+ Hits        27915    28210     +295     
- Misses       2855     2873      +18     

Impacted Files	Coverage Δ
crate/rt/src/cmds/diff_cmd/diff_info_spec.rs	0.00% <0.00%> (ø)
crate/rt/src/cmds/diff_cmd/diff_state_spec.rs	0.00% <0.00%> (ø)
crate/rt/src/cmds/sub/apply_cmd.rs	72.89% <ø> (ø)
crate/rt/src/cmds/diff_cmd.rs	92.80% <91.41%> (-3.92%)	⬇️
crate/rt_model/src/outcomes/cmd_outcome.rs	81.81% <100.00%> (+6.81%)	⬆️
workspace_tests/src/items/sh_cmd_item.rs	97.11% <100.00%> (-0.05%)	⬇️
workspace_tests/src/items/tar_x_item.rs	99.49% <100.00%> (ø)
workspace_tests/src/rt/cmds/diff_cmd.rs	100.00% <100.00%> (+0.29%)	⬆️

... and 2 files with indirect coverage changes

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