Support to display multithreaded links

[zhangyinhao1234]

Refer to the implementation of spring's async. We use our own runable and thread pool to realize the display of multithreaded links. This code has been developed and run on version 1.8.3, and has been running stably for one year.

example：

<dependency> <groupId>com.navercorp.pinpoint</groupId> <artifactId>pinpoint-java-sdk</artifactId> <version>2.3-SNAPSHOT</version> </dependency>

`

private ThreadPoolExecutor triggerPool = new AsyncThreadPoolExecutor(
32,
256,
60L,
TimeUnit.SECONDS,
new LinkedBlockingQueue(1000));

@GetMapping("/hello1")
public String test11(String name) throws InterruptedException {
    String hello = helloService.hello();
    triggerPool.execute(new AsyncRun() {
        @Override
        public Object asyncRun() {
            String pp = helloService.hello2(name, "PP");
            return pp;
        }
    }.getRunnable());
    return hello;
}


@GetMapping("/hello2")
public String test12(String name) throws InterruptedException, ExecutionException {
    String hello = helloService.hello();
    Future pp = triggerPool.submit(new AsyncRun() {
        @Override
        public Object asyncRun() {
            String pp = helloService.hello2(name, "PP");
            return pp;
        }
    }.getCallable());
    return hello;
}

`

[zhangyinhao1234]

CI error so create new to master
#7649