Use enum for no-op PauseDetectorWrapper

[mp911de]

To avoid anonymous classes fiddling in Graal Native compilation, we should switch to a named type, ideally an enum.

Error: No instances of io.lettuce.core.metrics.DefaultCommandLatencyCollector$DefaultPauseDetectorWrapper are allowed in the image heap as this class should be initialized at image runtime. To see how this object got instantiated use --trace-object-instantiation=io.lettuce.core.metrics.DefaultCommandLatencyCollector$DefaultPauseDetectorWrapper.
Trace: Object was reached by
  trying to constant fold static field io.lettuce.core.metrics.DefaultCommandLatencyCollector.GLOBAL_PAUSE_DETECTOR
    at io.lettuce.core.metrics.DefaultCommandLatencyCollector.recordCommandLatency(DefaultCommandLatencyCollector.java:109)
  parsing method io.lettuce.core.metrics.DefaultCommandLatencyCollector.recordCommandLatency(DefaultCommandLatencyCollector.java:100) reachable via the parsing context
    at io.lettuce.core.protocol.CommandHandler.recordLatency(CommandHandler.java:914)
    at io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:771)
    at io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:659)
    at io.lettuce.core.protocol.CommandHandler.channelRead(CommandHandler.java:599)
    at root method.(Unknown Source)
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