PMM-13154 PG17 support in QAN

[artemgavrilov]

PMM-13154

Link to the Feature Build: SUBMODULES-3700

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov]

Codecov Report

Attention: Patch coverage is 51.59817% with 106 lines in your changes missing coverage. Please review.

Project coverage is 43.24%. Comparing base (e6119b4) to head (a093ea2).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...nts/postgres/pgstatmonitor/pgstatmonitor_models.go	29.03%	43 Missing and 1 partial ⚠️
...ent/agents/postgres/pgstatmonitor/pgstatmonitor.go	19.51%	33 Missing ⚠️
...gres/pgstatstatements/pg_stat_statements_models.go	71.57%	25 Missing and 2 partials ⚠️
...ents/postgres/pgstatstatements/pgstatstatements.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3159      +/-   ##
==========================================
- Coverage   43.40%   43.24%   -0.17%     
==========================================
  Files         399      399              
  Lines       41698    41717      +19     
==========================================
- Hits        18101    18041      -60     
- Misses      21581    21666      +85     
+ Partials     2016     2010       -6     

Flag	Coverage Δ
admin	11.67% <ø> (ø)
agent	52.24% <49.76%> (-0.79%)	⬇️
vmproxy	66.66% <ø> (ø)

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[artemgavrilov]

Hey @BupycHuk , I reworked this PR:

1. Added local_blk_read/write_time metrics
2. Changed QAN API according to new fields, deprecated old fields (but they are still working and return valid information)
3. Rewrote pg_stat_statements view reading (now it's the same as for pg_stat_monitor) to allow different schemas.

Please take a look once again