feat(async/unstable): add allKeyed and allSettledKeyed

[tomas-zijdemans]

Should resolve: #6863

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.08%. Comparing base (0aa59e2) to head (9f562e9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6959      +/-   ##
==========================================
- Coverage   94.08%   94.08%   -0.01%     
==========================================
  Files         600      601       +1     
  Lines       43540    43570      +30     
  Branches     6991     6993       +2     
==========================================
+ Hits        40965    40993      +28     
- Misses       2520     2521       +1     
- Partials       55       56       +1     

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