make nacos-client sdk remove prometheus dependency and metrics with other way.

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提一个实际应用中碰到的一个小问题，nacos-client依赖了一个较低的prometheus版本，而且非可选，作为核心客户端sdk做到尽可能轻量级的依赖，或者一个Default实现，JMX等，如果需要prometheus，则由adapter或者另一个依赖完成，对sdk的依赖规范来讲，要多一次依赖去除和更新版本的引入，无法精简，期待一个精简的nacos-SDK。

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