checkerboard Gibbs inference for discrete HMM

[littleredcomputer]

• this is currently a draft

[linear]

GEN-948 devise a recipe for checkerboard choicemaps (HMM + gibbs)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.76%. Comparing base (c954138) to head (bfe798d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1495      +/-   ##
==========================================
+ Coverage   88.69%   88.76%   +0.06%     
==========================================
  Files          56       56              
  Lines        3998     4022      +24     
==========================================
+ Hits         3546     3570      +24     
  Misses        452      452              

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