fix(promise): forward pool error events

[GiHoon1123]

Refs #3749

Promise pools inherit lifecycle events from the underlying core pool, but the error event was not forwarded and was not exposed in the promise pool types.

This adds error to the forwarded pool events and adds a matching pool.on('error', ...) overload for the promise API. The existing promise wrapper event test now covers error forwarding, and the TypeScript build tests cover the promise pool event signature.

Tests:

• npm run typecheck
• npm run lint
• npm run test:build

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.51%. Comparing base (f3a60bc) to head (90f419a).
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4487   +/-   ##
=======================================
  Coverage   92.50%   92.51%           
=======================================
  Files          93       93           
  Lines       15909    15915    +6     
  Branches     2275     2275           
=======================================
+ Hits        14717    14723    +6     
  Misses       1192     1192           

Flag	Coverage Δ
compression-0	92.12% <100.00%> (+<0.01%)	⬆️
compression-1	92.49% <100.00%> (+<0.01%)	⬆️
static-parser-0	91.32% <100.00%> (+<0.01%)	⬆️
static-parser-1	91.44% <100.00%> (+<0.01%)	⬆️
tls-0	92.07% <100.00%> (+<0.01%)	⬆️
tls-1	92.51% <100.00%> (+<0.01%)	⬆️

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[sidorares]

@wellwelwel don't merge just yet. Wanted to check first that pool tracks idle connection errors at all - that might be not the case