Improve mysql2 instrumentation

[timokoessler]

• Fix pool instrumentation
• Fix context confusion when using pool under higher concurrency
• Fix missing instrumentation of .prepare function

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

⚡ Enhancements

• Added prepare instrumentation and hooked prepare into SQL inspection
• Added warning for outdated mysql2 versions and version check logic
• Updated tests to cover pools, prepare, context propagation, and warnings
• Added mysql2 v3.18 devDependency rewrite entry in package.json

🐛 Bugfixes

• Fixed pool instrumentation and ensured context propagation under concurrency

🔧 Refactors

• Introduced helper to extract SQL and params from various argument shapes

^{More info}

[codecov]

Codecov Report

❌ Patch coverage is 97.09302% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
library/sinks/MySQL2.ts	97.09%	5 Missing ⚠️

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