Add PRQL

[vanillajonathan]

PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement.

https://prql-lang.org/
https://github.com/PRQL/prql

[muniu-bot]

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[codecov-commenter]

Codecov Report

Merging #945 (a4432d7) into master (89659e4) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #945   +/-   ##
=======================================
  Coverage   85.76%   85.76%           
=======================================
  Files          51       51           
  Lines        5001     5001           
=======================================
  Hits         4289     4289           
  Misses        712      712           

Files	Coverage Δ
src/theme/icon.rs	100.00% <ø> (ø)

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