Chore: Set grpc limits explicitly (#2101)

Set `MaxReceiveMsgSize` as 32mb and `MaxSendMsgSize` as 100mb

.changeset/floppy-singers-carry.md

@@ -0,0 +1,5 @@
+---
+'grafana-zabbix': patch
+---
+
+Set grpc limits explicitly

pkg/plugin.go

@@ -26,6 +26,10 @@ func main() {
 		CallResourceHandler: httpResourceHandler,
 		QueryDataHandler:    ds,
 		CheckHealthHandler:  ds,
+		GRPCSettings: backend.GRPCSettings{
+			MaxReceiveMsgSize: 32 * 1024 * 1024,
+			MaxSendMsgSize:    100 * 1024 * 1024,
+		},
 	})
 	if err != nil {
 		pluginLogger.Error("Error starting Zabbix datasource", "error", err.Error())