Monitor deploy as a kubernetes CR

[caoxianfei1]

trafficstars

When deploy curve cluster monitor, now we using enable as ON-OFF, and we can split it as a K8s CR to manage it.

现在集群的监控是在部署curvebs/curvefs cr的时候，在指定资源CRD的yaml文件中通过Monitor字段中的Enable设置是否部署集群监控（Prometheus, Grafana, node-exporter）。但是，这种方式不太优雅，一种更好的方法是定义CurveMonitor这个CR,在自定义CR的controller中实现部署逻辑。从而就不需要在curvebs/curvefs集群中定义Monitor字段。

[peaceLT]

I would like to try this issue.

[caoxianfei1]

@peaceLT The issue has assign to others, you can choose another~

[mikechengwei]

/assign