fix(httpclient-vertx-5): align with project conventions and add chaos tests
- Rename LOG to logger to follow project naming conventions
- Align WebSocket close operation ordering with Vert.x 4 implementation
- Add vertx-5 to chaos test workflow matrix
- Update README version references from 5.0.1 to 5.0.7
- Fix @since annotation to 7.6.0
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>