Support collStats command.

[ekalinin]

Closes #159.

[codecov]

Codecov Report

Merging #206 (323206e) into main (520beae) will increase coverage by 0.29%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
+ Coverage   47.79%   48.09%   +0.29%     
==========================================
  Files          91       92       +1     
  Lines        4613     4668      +55     
==========================================
+ Hits         2205     2245      +40     
- Misses       2006     2016      +10     
- Partials      402      407       +5     

Impacted Files	Coverage Δ
internal/handlers/shared/msg_collstats.go	62.50% <62.50%> (ø)
internal/pg/pool.go	72.88% <85.71%> (+1.72%)	⬆️
internal/handlers/handler.go	52.17% <100.00%> (+0.52%)	⬆️

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[AlekSi]

Thank you!