Include entry for current and discovered states, and diff in app_cycle example.

[azriel91]

Closes #91 -- though this is handled at the application level, not by the framework.

• Include entry for current and discovered states, and diff in app_cycle example.
• Sort progress bars based on insertion order.
• Use ▰ and ▱ parallelogram characters for progress bars.
• Spinner progress is now rendered.

[codecov]

Codecov Report

Patch coverage: 68.39% and project coverage change: -0.12 ⚠️

Comparison is base (854c8aa) 93.47% compared to head (36ee243) 93.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   93.47%   93.35%   -0.12%     
==========================================
  Files         276      273       -3     
  Lines       20497    20669     +172     
==========================================
+ Hits        19159    19296     +137     
- Misses       1338     1373      +35     

Impacted Files	Coverage Δ
crate/fmt/src/presentable.rs	100.00% <ø> (ø)
crate/fmt/src/presentable/tuple_impl.rs	100.00% <ø> (+90.74%)	⬆️
crate/rt_model/src/in_memory_text_output.rs	44.44% <0.00%> (ø)
workspace_tests/src/fn_tracker_presenter.rs	33.01% <0.00%> (-7.68%)	⬇️
workspace_tests/src/no_op_output.rs	44.44% <0.00%> (ø)
...ate/rt_model_native/src/output/cli_md_presenter.rs	71.84% <20.68%> (-24.08%)	⬇️
crate/rt_model_native/src/output/cli_output.rs	86.70% <88.96%> (+1.88%)	⬆️
crate/code_gen/src/cmd/impl_build.rs	99.37% <100.00%> (ø)
crate/rt/src/cmds/sub/apply_cmd.rs	78.12% <100.00%> (+1.86%)	⬆️
...ate/rt/src/cmds/sub/states_current_discover_cmd.rs	97.22% <100.00%> (-0.15%)	⬇️
... and 7 more

... and 3 files with indirect coverage changes

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