Extract parameter list into one variable in QueryDocuments

[seeforschauer]

Description

This PR is a part of #167.

Explain command will add yet another parameter to the QueryDocuments, so this PR gathers QueryDocuments parameters at one variable.

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• (for maintainers only) I set Reviewers, Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #910 (931f785) into main (8f7f1d1) will decrease coverage by 0.11%.
The diff coverage is 65.85%.

@@            Coverage Diff             @@
##             main     #910      +/-   ##
==========================================
- Coverage   59.08%   58.96%   -0.12%     
==========================================
  Files         224      224              
  Lines       10179    10180       +1     
==========================================
- Hits         6014     6003      -11     
- Misses       3454     3465      +11     
- Partials      711      712       +1     

Impacted Files	Coverage Δ
internal/handlers/pg/pg.go	100.00% <ø> (ø)
internal/handlers/pg/msg_insert.go	41.93% <40.00%> (ø)
internal/handlers/pg/msg_count.go	46.42% <50.00%> (ø)
internal/handlers/pg/msg_find.go	66.40% <57.14%> (ø)
internal/handlers/pg/msg_update.go	52.25% <62.50%> (ø)
internal/handlers/pg/msg_delete.go	43.11% <66.66%> (ø)
internal/handlers/pg/msg_dbstats.go	65.11% <75.00%> (-6.98%)	⬇️
internal/handlers/pg/msg_findandmodify.go	77.11% <100.00%> (-0.17%)	⬇️
internal/handlers/pg/pgdb/query_documents.go	60.91% <100.00%> (+1.39%)	⬆️
... and 2 more

Flag	Coverage Δ
integration	61.14% <65.85%> (-0.07%)	⬇️
mongodb	18.53% <0.00%> (-0.04%)	⬇️
pg	61.14% <65.85%> (-0.07%)	⬇️
unit	25.06% <7.31%> (-0.07%)	⬇️

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[rumyantseva]

These changes make sense to me.

Actually, I was thinking of moving this as part of my previous PR but decided not to make it even more huge :)