feat(async): stabilize AbortSignal support in debounce()

[tomas-zijdemans]

Moving the abort signal support from unstable to the stable version. Deleting the unstable files since they now don't hold any new features, and also are out of sync with the stable version (they can always be added back in later if needed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.42%. Comparing base (a3a6ef6) to head (b43cf02).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7096      +/-   ##
==========================================
- Coverage   94.43%   94.42%   -0.01%     
==========================================
  Files         630      629       -1     
  Lines       50566    50538      -28     
  Branches     8969     8968       -1     
==========================================
- Hits        47750    47722      -28     
  Misses       2247     2247              
  Partials      569      569              

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