Java Virtual Thread Support

[barisyild]

An optional virtual thread support can be added for the Java target. (JDK 21+)

Here is extern:

package jvm.lang;

import java.lang.Runnable;

@:native("java.lang.Thread")
extern class Thread {
    public static function startVirtualThread(task:Job):Thread;

    public static function currentThread():Thread;

    public function isVirtual():Bool;
}

private abstract Job(Runnable) from Runnable to Runnable {
    public inline function new(job:() -> Void) {
        this = cast job;
    }
}

System Thread implementation: https://github.com/HaxeFoundation/haxe/blob/cefabb12021d27ab56ed3f1c75667318831f09f6/std/jvm/_std/sys/thread/Thread.hx

[sebthom]

Hi @barisyild, supporting virual threads is a good idea. A PR is welcome!

[barisyild]

HaxeFoundation/haxe#12301

[github-actions]

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