[metrics] remove go-kit dependencies

[0xcb9ff9]

Description

Now implementation use go-kit package help build the metrics interface, but there is a performance cost in the implementation of go-kit, this PR replaces go-kit, and directly uses the prometheus metrics interface

exist cost code: prometheus.go#L159

makeLabels will be called every time the metrics is updated

func makeLabels(labelValues ...string) prometheus.Labels {
	labels := prometheus.Labels{}
	for i := 0; i < len(labelValues); i += 2 {
		labels[labelValues[i]] = labelValues[i+1]
	}
	return labels
}

heap pprof results:

Changes include

• Bugfix (non-breaking change that solves an issue)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels

Testing

• I have tested this code with the official test suite

[DarianShawn]

Every step makes sense.
Thanks for the contribution.