Capture only one delimited field at a time in SQL parser

[jakeboone02]

Fixes #482.

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Sandbox	Source
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react-querybuilder-dnd-example	Configuration
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react-querybuilder-bootstrap-example	Configuration
react-querybuilder-bulma-example	Configuration
react-querybuilder-chakra-example	Configuration
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react-querybuilder-mantine-example	Configuration
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[codecov]

Codecov Report

Merging #483 (66530ce) into main (5327f02) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #483   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files          130       130           
  Lines         3505      3505           
  Branches      1664      1664           
=========================================
  Hits          3505      3505           

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