Assorted `render_trace` fixes and improvements:

[fdxmw]

• Add an enum_name utility to convert enum values to their names. Python 3.11 changed the behavior of IntEnum.__str__ to return the enum value rather than the enum name (https://docs.python.org/3/library/enum.html#enum.IntEnum), so enum_name makes it easier to see the names.
• Update state machine example to display state names with enum_name.
• Fix a bug in render_trace's ruler rendering, where cycle numbers were not truncated appropriately when the cycle number is too long. Add a test.
• Display more cycles in the renderer demo.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.31%. Comparing base (401ab37) to head (267c317).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #440 +/- ## =============================================== + Coverage 91.29% 91.31% +0.02% =============================================== Files 24 24 Lines 6351 6357 +6 =============================================== + Hits 5798 5805 +7 + Misses 553 552 -1 ```

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