Consolidate command logic for composability and single set of progress bar rendering.

[azriel91]

Closes #120.

• Removes hack for showing one set of progress bars.
• Allows commands to use other commands as sub commands.

[codecov]

Codecov Report

Patch coverage: 79.08% and project coverage change: -0.12 ⚠️

Comparison is base (85cb088) 90.83% compared to head (1262889) 90.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
- Coverage   90.83%   90.72%   -0.12%     
==========================================
  Files         334      337       +3     
  Lines       30403    30735     +332     
==========================================
+ Hits        27618    27883     +265     
- Misses       2785     2852      +67     

Impacted Files	Coverage Δ
crate/rt/src/cmds/clean_cmd.rs	50.00% <0.00%> (-50.00%)	⬇️
...e/rt/src/cmds/cmd_ctx_internal/cmd_independence.rs	0.00% <0.00%> (ø)
crate/rt/src/cmds/ensure_cmd.rs	50.00% <0.00%> (-50.00%)	⬇️
crate/rt_model_core/src/cmd_progress_tracker.rs	81.81% <ø> (+5.95%)	⬆️
crate/rt_model_native/src/output/cli_output.rs	82.45% <ø> (+1.55%)	⬆️
workspace_tests/src/items/sh_cmd_item.rs	96.68% <ø> (ø)
workspace_tests/src/items/tar_x_item.rs	99.50% <ø> (ø)
workspace_tests/src/rt/cmds/clean_cmd.rs	99.41% <ø> (ø)
workspace_tests/src/rt/cmds/ensure_cmd.rs	99.36% <ø> (ø)
...e_tests/src/rt/cmds/sub/states_desired_read_cmd.rs	98.66% <ø> (ø)
... and 10 more

... and 1 file with indirect coverage changes

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