Integate metering module and support metering data csv format export.

Signed-off-by: Rao Yunkun <yunkunrao@yunify.com>

pkg/simple/client/metering/options.go

@@ -0,0 +1,9 @@
+package metering
+
+type Options struct {
+	Enable bool `json:"enable" yaml:"enable"`
+}
+
+func NewMeteringOptions() *Options {
+	return &Options{}
+}