Does Shenyu support JDK17 now?

### Question

error message:
`
Exception in thread "Thread-47" java.lang.reflect.InaccessibleObjectException: Unable to make field private static java.util.IdentityHashMap java.lang.ApplicationShutdownHooks.hooks accessible: module java.base does not "opens java.lang" to unnamed module @57250572
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
at org.apache.shenyu.client.core.shutdown.ShenyuClientShutdownHook$TakeoverOtherHooksThread.run(ShenyuClientShutdownHook.java:99)
`

Start at ShenyuClientShutdownHook.java:99 and inspect how TakeoverOtherHooksThread accesses ApplicationShutdownHooks under JDK 17. Reproduce the reported exception with JDK 17 and determine the project’s expected compatibility behavior; the issue is done when the shutdown-hook handling no longer fails there or the supported JDK range is clearly documented.

Written by the indexing model from the issue text.