Alerting: State manager to use InstanceStore (#53852)

* move saving the state to state manager when scheduler stops
* move saving state to ProcessEvalResults

* add GetRuleKey to State
* add LogContext to AlertRuleKey

pkg/services/ngalert/models/alert_rule.go

@@ -227,6 +227,10 @@ type AlertRuleKey struct {
 	UID   string `xorm:"uid"`
 }
 
+func (k AlertRuleKey) LogContext() []interface{} {
+	return []interface{}{"rule_uid", k.UID, "org_id", k.OrgID}
+}
+
 type AlertRuleKeyWithVersion struct {
 	Version      int64
 	AlertRuleKey `xorm:"extends"`