[DPE-8932] Expose PG stats configuration (16/edge)

[dragomirp]

Expose config parameters for pg_stat_statements.

Specification is DA249.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.42%. Comparing base (02473a4) to head (3cd9b95).
⚠️ Report is 2 commits behind head on 16/edge.

Additional details and impacted files

@@             Coverage Diff             @@
##           16/edge    #1420      +/-   ##
===========================================
+ Coverage    70.38%   70.42%   +0.04%     
===========================================
  Files           15       15              
  Lines         4275     4281       +6     
  Branches       694      694              
===========================================
+ Hits          3009     3015       +6     
  Misses        1057     1057              
  Partials       209      209              

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