Java 19 features checklist

[AloisSeckar]

Implement demos for all new JEPs included in JDK 19

This issue works as a tracker for the respective tasks

• 405 - Record Patterns (Preview)
• 422 - Linux/RISC-V Port
• 424 - Foreign Function & Memory API (Preview)
• 425 - Virtual Threads (Preview)
• 426 - Vector API (Fourth Incubator)
• 427 - Pattern Matching for switch (Third Preview)
• 428 - Structured Concurrency (Incubator)