feat(async/unstable): add pooledMapSettled

[tomas-zijdemans]

Introduces pooledMapSettled. Like the stable pooledMap, but does not fail fast.

The relationship to pooledMap mirrors Promise.allSettled vs Promise.all

[codecov]

Codecov Report

❌ Patch coverage is 97.61905% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.74%. Comparing base (4936f23) to head (9c8c099).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
async/unstable_pool_settled.ts	97.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7015      +/-   ##
==========================================
- Coverage   94.16%   93.74%   -0.42%     
==========================================
  Files         618      621       +3     
  Lines       48802    49472     +670     
  Branches     8601     8670      +69     
==========================================
+ Hits        45954    46378     +424     
- Misses       2779     3025     +246     
  Partials       69       69              

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