Use time series format internally

pkg/timeseries/models.go

@@ -1,6 +1,10 @@
 package timeseries
 
-import "time"
+import (
+	"time"
+
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
+)
 
 type TimePoint struct {
 	Time  time.Time
@@ -16,3 +20,12 @@ func NewTimeSeries() TimeSeries {
 func (ts *TimeSeries) Len() int {
 	return len(*ts)
 }
+
+type TimeSeriesData struct {
+	TS   TimeSeries
+	Meta TimeSeriesMeta
+}
+
+type TimeSeriesMeta struct {
+	Item *zabbix.Item
+}