Add incubator ComposableAnnotatingSampler

[anuraaga]

This finishes up the implementation of the development spec composable samplers. I don't know how commonly used annotating will be but it's very easy to implement

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (2c379c7) to head (77568fa).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7804   +/-   ##
=========================================
  Coverage     90.16%   90.17%           
- Complexity     7202     7206    +4     
=========================================
  Files           816      817    +1     
  Lines         21737    21752   +15     
  Branches       2130     2130           
=========================================
+ Hits          19599    19614   +15     
  Misses         1468     1468           
  Partials        670      670           

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[jack-berg]

Thanks!