*: move metric neogo_version out of pkg/network

Close #3682

Signed-off-by: Ekaterina Pavlova <ekt@morphbits.io>

cli/server/metrics.go

@@ -0,0 +1,23 @@
+package server
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var neogoVersion = prometheus.NewGaugeVec(
+	prometheus.GaugeOpts{
+		Help:      "NeoGo version",
+		Name:      "version",
+		Namespace: "neogo",
+	},
+	[]string{"version"})
+
+func setNeoGoVersion(nodeVer string) {
+	neogoVersion.WithLabelValues(nodeVer).Add(1)
+}
+
+func init() {
+	prometheus.MustRegister(
+		neogoVersion,
+	)
+}