PMM-14517 PG-18 support in QAN

[artemgavrilov]

PMM-14517

Link to the Feature Build: SUBMODULES-4069

[codecov]

Codecov Report

❌ Patch coverage is 39.47368% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.75%. Comparing base (9ab92b6) to head (129f531).
⚠️ Report is 4 commits behind head on v3.

Files with missing lines	Patch %	Lines
...ent/agents/postgres/pgstatmonitor/pgstatmonitor.go	19.04%	17 Missing ⚠️
...nts/postgres/pgstatmonitor/pgstatmonitor_models.go	55.55%	4 Missing ⚠️
...ents/postgres/pgstatstatements/pgstatstatements.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #4739      +/-   ##
==========================================
+ Coverage   45.72%   45.75%   +0.02%     
==========================================
  Files         364      364              
  Lines       37755    37790      +35     
==========================================
+ Hits        17265    17290      +25     
- Misses      18834    18843       +9     
- Partials     1656     1657       +1     

Flag	Coverage Δ
admin	17.92% <ø> (ø)
agent	53.64% <28.12%> (+0.03%)	⬆️
managed	46.23% <100.00%> (+0.01%)	⬆️
vmproxy	72.09% <ø> (ø)

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[artemgavrilov]

For PGSS we collecting very limited set of data and I don't know why. I implemented new PG18 data only for PGSM for now. PGSS should be discussed I think.

[artemgavrilov]

I missed almost half of the implementation, so re-request review