Fix test failure under JDK 17 | 修复 JDK 17 下测试框架及用例报错的问题

Issue Description

Type: bug report

Describe what happened (or what feature you want)

The test cases will fail under JDK 17, due to JDK-compatibility of some test frameworks (e.g. PowerMock).

JDK 17 下测试用例会失败，部分原因是我们测试框架不支持 JDK 17 导致的（可能是版本太低，或确实不支持）。欢迎社区修复解决。

Some error messages:

com.alibaba.csp.sentinel.slots.statistic.base.LeapArrayTest

java.lang.ExceptionInInitializerError
	at jdk.internal.reflect.GeneratedSerializationConstructorAccessor4.newInstance(Unknown Source)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
	at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:48)
	at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:73)
	at org.mockito.internal.creation.instance.ObjenesisInstantiator.newInstance(ObjenesisInstantiator.java:19)
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:47)
	at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:25)
	at org.powermock.api.mockito.mockmaker.PowerMockMaker.createMock(PowerMockMaker.java:41)
	at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
	at org.mockito.internal.MockitoCore.mock(MockitoCore.java:62)
	at org.mockito.Mockito.mock(Mockito.java:1908)
	at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.createMethodInvocationControl(DefaultMockCreator.java:108)
	at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.doCreateMock(DefaultMockCreator.java:61)
	at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.createMock(DefaultMockCreator.java:53)
	at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.mock(DefaultMockCreator.java:40)
	at org.powermock.api.mockito.PowerMockito.mockStatic(PowerMockito.java:62)
	at com.alibaba.csp.sentinel.test.AbstractTimeBasedTest.<init>(AbstractTimeBasedTest.java:43)
	at com.alibaba.csp.sentinel.slots.statistic.base.LeapArrayTest.<init>(LeapArrayTest.java:29)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.createTestInstance(PowerMockJUnit44RunnerDelegateImpl.java:197)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.createTest(PowerMockJUnit44RunnerDelegateImpl.java:182)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:204)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:160)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:134)
	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:136)
	at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:117)
	at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)
	at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
	at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make private static void java.lang.System.initPhase1() accessible: module java.base does not "opens java.lang" to unnamed module @2e5d6d97
	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.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at org.powermock.reflect.internal.WhiteboxImpl.doGetAllMethods(WhiteboxImpl.java:1499)
	at org.powermock.reflect.internal.WhiteboxImpl.getAllMethods(WhiteboxImpl.java:1473)
	at org.powermock.reflect.internal.WhiteboxImpl.getMethods(WhiteboxImpl.java:1741)
	at org.powermock.reflect.internal.WhiteboxImpl.getMethods(WhiteboxImpl.java:1780)
	at org.powermock.reflect.internal.WhiteboxImpl.getBestMethodCandidate(WhiteboxImpl.java:999)
	at org.powermock.core.MockInvocation.findMethodToInvoke(MockInvocation.java:58)
	at org.powermock.core.MockInvocation.init(MockInvocation.java:35)
	at org.powermock.core.MockInvocation.<init>(MockInvocation.java:22)
	at org.powermock.core.MockGateway.doMethodCall(MockGateway.java:155)
	at org.powermock.core.MockGateway.methodCall(MockGateway.java:138)
	at com.alibaba.csp.sentinel.util.TimeUtil.<init>(TimeUtil.java:99)
	at com.alibaba.csp.sentinel.util.TimeUtil.<clinit>(TimeUtil.java:79)
	... 42 more

Tell us your environment

JDK 17, Sentinel 2.0.0-SNAPSHOT