test: add initial fuzz testing support

[mccutchen]

For now, we'll fuzz test for an hour every day, and report any failures via new pull requests.

Let's see how this works out for us?

[github-actions]

🔥 Run benchmarks comparing 75d4796 against main:

gh workflow run bench.yaml -f pr_number=77

Note: this comment will update with each new commit.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.07%. Comparing base (0a52171) to head (75d4796).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files           2        2           
  Lines         431      431           
=======================================
  Hits          427      427           
  Misses          2        2           
  Partials        2        2           

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