feature: add explain method to postgresql client

[norberttech]

Resolves: #xxx

Change Log

---

Added

• Client::explain() : Plan - to postgresql client
• More precise fetchScalarX functions to postgresql client

Fixed

Changed

Removed

Deprecated

Security

[codecov]

Codecov Report

❌ Patch coverage is 85.48621% with 100 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.76%. Comparing base (a285276) to head (f6dd3e0).
⚠️ Report is 2 commits behind head on 1.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x    #2093      +/-   ##
==========================================
+ Coverage   83.47%   83.76%   +0.28%     
==========================================
  Files        1120     1133      +13     
  Lines       39915    40604     +689     
==========================================
+ Hits        33319    34011     +692     
+ Misses       6596     6593       -3     

Components	Coverage Δ
etl	90.52% <ø> (+0.89%)	⬆️
cli	85.76% <ø> (ø)
lib-array-dot	95.00% <ø> (ø)
lib-azure-sdk	60.01% <ø> (ø)
lib-doctrine-dbal-bulk	95.14% <ø> (ø)
lib-filesystem	80.44% <ø> (ø)
lib-types	88.98% <ø> (+1.51%)	⬆️
lib-parquet	68.25% <ø> (ø)
lib-parquet-viewer	83.04% <ø> (ø)
lib-snappy	90.18% <ø> (+0.46%)	⬆️
bridge-filesystem-async-aws	90.95% <ø> (ø)
bridge-filesystem-azure	89.38% <ø> (ø)
bridge-monolog-http	96.89% <ø> (ø)
bridge-openapi-specification	91.50% <ø> (ø)
symfony-http-foundation	72.32% <ø> (ø)
adapter-chartjs	86.33% <ø> (ø)
adapter-csv	89.30% <ø> (ø)
adapter-doctrine	91.50% <ø> (ø)
adapter-elasticsearch	97.02% <ø> (ø)
adapter-google-sheet	97.05% <ø> (ø)
adapter-http	65.94% <ø> (ø)
adapter-json	89.69% <ø> (ø)
adapter-logger	83.33% <ø> (ø)
adapter-meilisearch	97.77% <ø> (ø)
adapter-parquet	79.92% <ø> (ø)
adapter-text	86.84% <ø> (ø)
adapter-xml	82.66% <ø> (ø)

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