Use proxy instead of list of container endpoints in FeedClientBuilder

[mohsin36]

We are currently using FeedClientBuilder.setEndpointUrl(List endpoints)
https://javadoc.io/doc/com.yahoo.vespa/vespa-feed-client-api/8.26.15/ai/vespa/feed/client/FeedClientBuilder.html#setEndpointUris(java.util.List)

However this causes connection issue during container host reboots or downtime even on a single node.

Can we use a reverse proxy instead of explicit list of containers? Reverse proxy would take care of forwarding requests only to healthy container nodes.