added cookies configuration in the client and connection

[pengye91]

We need the client to hold the server cookies information and send it back in the next rounds of querying next_page for deployment environments like K8S so that the query can hit the same pod.

[hantmac]

@pengye91 If you deploy databend using helm-chart, you can add this line for service databendlabs/helm-charts@c2f38f5#diff-fc722f05e387eeac16dc6a7ee17d7266bb294d902e7e556443903ae2550af6a3R22, so it will hit in the same pod and no need to persist cookies.

[pengye91]

@hantmac Adding this selector annotation will result in only one pod serving all traffics, including all handlers like HTTP and MySQL ones, which is not desirable for traffic loading. I think it's a more reasonable way to solve the issue by using the sticky session strategy in the Nginx ingress controller.