Add icon for PRQL

[vanillajonathan]

Description

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

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

This PR adds a database icon for .prql files.

• Relevant Issues : (none)
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation
  • Addition of icon for file extension

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (28c188b) 92.13% compared to head (cc6ef40) 92.13%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   92.13%   92.13%           
=======================================
  Files           8        8           
  Lines         623      623           
=======================================
  Hits          574      574           
  Misses         49       49           

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[avdv]

Thank you!