Add DynamicHMC as a sampling backend

[ptiede]

Trying this out becaues I have seen better results with DynamicHMC in some spot checks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.42%. Comparing base (a26ea2e) to head (c5df767).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #426      +/-   ##
==========================================
+ Coverage   92.35%   92.42%   +0.07%     
==========================================
  Files          33       33              
  Lines        1804     1821      +17     
==========================================
+ Hits         1666     1683      +17     
  Misses        138      138              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.