Start HashWheelTimer in ClientResources to avoid blocking calls in EventLoop

[mp911de]

HashWheelTimer starts lazily upon creating a new Task. Startup is synchronized and may result in a blocking call:

3:55:17.330 [lettuce-nioEventLoop-76-1] DEBUG io.lettuce.core.protocol.CommandHandler - [unknown, chid=0x1] Unexpected exception during request: reactor.blockhound.BlockingOperationError: Blocking call! jdk.internal.misc.Unsafe#park
reactor.blockhound.BlockingOperationError: Blocking call! jdk.internal.misc.Unsafe#park
    at java.base/jdk.internal.misc.Unsafe.park(Unsafe.java)
    at java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
    at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:885)
    at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1039)
    at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1345)
    at java.base/java.util.concurrent.CountDownLatch.await(CountDownLatch.java:232)
    at io.netty.util.HashedWheelTimer.start(HashedWheelTimer.java:349)
    at io.netty.util.HashedWheelTimer.newTimeout(HashedWheelTimer.java:416)
    at io.lettuce.core.protocol.RedisHandshakeHandler.channelRegistered(RedisHandshakeHandler.java:65)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:166)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:152)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:145)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRegistered(DefaultChannelPipeline.java:1383)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:166)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:152)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRegistered(DefaultChannelPipeline.java:815)
    at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:505)
    at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:417)
    at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:474)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:834)

We should call HashedWheelTimer.start() when creating DefaultClientResources to start the timer eagerly.