feat(postgres-driver): Migrate to our Pool implementation

[ovr]

Fix #10142

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 57.51%. Comparing base (4f2e72f) to head (030aae0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/cubejs-backend-shared/src/pool.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10389      +/-   ##
==========================================
- Coverage   57.51%   57.51%   -0.01%     
==========================================
  Files         222      222              
  Lines       17340    17341       +1     
  Branches     3546     3546              
==========================================
  Hits         9973     9973              
- Misses       6832     6833       +1     
  Partials      535      535              

Flag	Coverage Δ
cube-backend	57.51% <0.00%> (-0.01%)	⬇️

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