Support $gt comparision operator

[ribaraka]

Refs #251.

[AlekSi]

Let's finish #309 first

[codecov]

Codecov Report

Merging #330 (15185c0) into main (a64780c) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head 15185c0 differs from pull request most recent head f7c61ba. Consider uploading reports for the commit f7c61ba to get more accurate results

@@            Coverage Diff             @@
##             main     #330      +/-   ##
==========================================
+ Coverage   57.60%   57.66%   +0.05%     
==========================================
  Files         117      117              
  Lines        6072     6080       +8     
==========================================
+ Hits         3498     3506       +8     
  Misses       2054     2054              
  Partials      520      520              

Flag	Coverage Δ
FerretDB	33.65% <20.00%> (-0.05%)	⬇️
MongoDB	2.84% <0.00%> (-0.01%)	⬇️
integration	33.69% <20.00%> (-0.05%)	⬇️
tests	50.66% <100.00%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
internal/handlers/common/compare.go	85.46% <100.00%> (ø)
internal/handlers/common/filter.go	85.27% <100.00%> (+0.37%)	⬆️

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[AlekSi]

Thank you!