[feature request] connection lifetime for backend connection

we would like to use connection lifetime config like

https://pkg.go.dev/database/sql#DB.SetConnMaxLifetime

in some our use cases, we use cloud service endpoint as proxysql backend.

mysql_servers=
(
    {
        address         = "db.endpoint.com"
        port            = 3306
        hostgroup       = 0
        # max_connections: 1000 is the default value
        max_connections = 9000
        weight          = 0
        status          = "ONLINE"
        use_ssl         = 0
        comment         = "cloud service endpoint"
    }
)

currently when we scale out the number of node for db.endpoint.com, the time that new node is actually used equivalent to the existing node becomes slowly because of basic connection reuse policy. so we want to set temporally shorter variable when we scale out.

I would like to be happy if ProxySQL have some connection lifetime config. do not accept any new request for the backend connection when lifetime has gone, is nice for us.