Release 3.0.0-rc.4

[JanJakes]

Release 3.0.0-rc.4

Version bump and changelog update for release 3.0.0-rc.4.

Changelog draft:

• Normalize BIT column default literals (#439)
• Optimize MySQL lexer (~2× speedup) (#424)
• Fix RAND() function behavior (#363)
• CI: Disable Xdebug, use Rust release builds, consolidate unit-test matrix (#425)
• GitHub Actions workflow updates (#404)
• Add native Rust-based MySQL parser extension (#381, #384, #386, #389, #390, #394, #398)
• Ship native parser as WASM (#395, #396, #397, #399, #400, #401)
• Add SQLite plugin landing page (#407, #412)
• Check Playground web runtime compatibility (#419)

Full changelog: v3.0.0-rc.3...release/v3.0.0-rc.4

Next steps

1. Review the changes in this pull request.
2. Push any additional edits to this branch (release/v3.0.0-rc.4).
3. Merge this pull request to complete the release.

Merging will automatically build the plugin ZIP and create a GitHub release.

Note

This is a pre-release. It will not be deployed to WordPress.org.