Bump version to 0.3.0 in VERSION file

[tombonfert]

Summary

Bump version to 0.3.0 to prepare a new release

Changes

Test Plan

• Unit tests added/updated
• Manual testing completed
• Documentation updated (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• No new linter warnings introduced

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.67%. Comparing base (0a391ad) to head (d386f12).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   88.67%   88.67%           
=======================================
  Files          60       60           
  Lines        5008     5008           
  Branches      596      596           
=======================================
  Hits         4441     4441           
  Misses        461      461           
  Partials      106      106           

Flag	Coverage Δ
query_engine	84.57% <ø> (ø)
reporting	94.19% <ø> (ø)

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