AlertingNG: Split into several packages (#31719)

* AlertingNG: Split into several packages

* Move AlertQuery to models

pkg/services/ngalert/schedule/fetcher.go

@@ -0,0 +1,17 @@
+package schedule
+
+import (
+	"time"
+
+	"github.com/grafana/grafana/pkg/services/ngalert/models"
+)
+
+func (sch *schedule) fetchAllDetails(now time.Time) []*models.AlertDefinition {
+	q := models.ListAlertDefinitionsQuery{}
+	err := sch.store.GetAlertDefinitions(&q)
+	if err != nil {
+		sch.log.Error("failed to fetch alert definitions", "now", now, "err", err)
+		return nil
+	}
+	return q.Result
+}