Add new comparators: Exists and NotExists

[sunboyy]

[codecov[bot]]

Codecov Report

Base: 94.89% // Head: 95.03% // Increases project coverage by +0.13% :tada:

Coverage data is based on head (d0a37cb) compared to base (482dd09). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   94.89%   95.03%   +0.13%     
==========================================
  Files          21       21              
  Lines         941      966      +25     
==========================================
+ Hits          893      918      +25     
  Misses         27       27              
  Partials       21       21              

Flag	Coverage Δ
unittests	95.03% <100.00%> (+0.13%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/mongo/models.go	98.07% <100.00%> (+0.16%)	:arrow_up:
internal/spec/query.go	100.00% <100.00%> (ø)
internal/testutils/multilines.go	100.00% <100.00%> (ø)

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