feat(async/unstable): add poll function

[tomas-zijdemans]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.18%. Comparing base (d3d496a) to head (ee3d6a9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6973   +/-   ##
=======================================
  Coverage   94.17%   94.18%           
=======================================
  Files         599      600    +1     
  Lines       43187    43203   +16     
  Branches     6931     6938    +7     
=======================================
+ Hits        40673    40692   +19     
+ Misses       2459     2457    -2     
+ Partials       55       54    -1     

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