Implement rerun for random walk samplers

[edknock]

No description provided.

[thomrawson]

Just sharing my own success with the use of this rerun feature.
Before re-runs enabled:

And after re-runs enabled:

Thanks Ed! :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.46%. Comparing base (f712d7b) to head (a0cd09f).
Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
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  Coverage   99.46%   99.46%           
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  Files          69       69           
  Lines        5187     5203   +16     
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+ Hits         5159     5175   +16     
  Misses         28       28           

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[richfitz]

Do you want to make rerun_random = TRUE the default? I feel that's what most people preferred in the end