Add helper for getting required parameters

[AlekSi]

Refs #326.

[codecov]

Codecov Report

Merging #339 (9c0025a) into main (537f050) will decrease coverage by 0.63%.
The diff coverage is 25.89%.

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   52.14%   51.51%   -0.64%     
==========================================
  Files         114      115       +1     
  Lines        5525     5591      +66     
==========================================
- Hits         2881     2880       -1     
- Misses       2232     2281      +49     
- Partials      412      430      +18     

Impacted Files	Coverage Δ
internal/handlers/msg_listcollections.go	0.00% <0.00%> (ø)
internal/handlers/sql/msg_delete.go	0.00% <0.00%> (ø)
internal/handlers/sql/msg_insert.go	0.00% <0.00%> (ø)
internal/handlers/handler.go	53.52% <14.28%> (-3.02%)	⬇️
internal/handlers/msg_collstats.go	54.54% <16.66%> (-7.96%)	⬇️
internal/handlers/jsonb1/msg_find_or_count.go	72.00% <25.00%> (-1.47%)	⬇️
internal/handlers/msg_dbstats.go	69.23% <25.00%> (-5.77%)	⬇️
internal/handlers/jsonb1/msg_delete.go	56.92% <33.33%> (-5.15%)	⬇️
internal/handlers/jsonb1/msg_insert.go	54.34% <33.33%> (-7.20%)	⬇️
internal/handlers/jsonb1/msg_update.go	53.71% <33.33%> (-2.43%)	⬇️
... and 10 more

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