refactor(contract): generate Vote enum variant strings with a macro

[codecov[bot]]

Codecov Report

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

Project coverage is 93.54%. Comparing base (a639197) to head (f60a925). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #634 +/- ## ========================================== - Coverage 93.54% 93.54% -0.01% ========================================== Files 241 241 Lines 33885 33883 -2 ========================================== - Hits 31699 31697 -2 Misses 2186 2186 ```

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