[Feature] Upgrade to JDK/JVM21 to adopt ZGC and VirtualThread

[wu-sheng]

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• I had searched in the issues and found no similar feature requirement.

Description

With the recent 10.3 update, we have optimized the thread pool performance a lot -- from 800 threads to ~150 threads.

Use case

With JDK/JRE21 new features, virtual thread and ZGC have potential advantages to optimize OAP performance.
We should be able to consider that.

Related issues

No response

Are you willing to submit a pull request to implement this on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct