Add randomized DNS resolver option for load balancing#907
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Summary
HTTPClient.Configuration.DNSResolverwith.system(default) and.randomizedcases. When
.randomizedis selected,NIORandomizedDNSResolveris installed on theunderlying
ClientBootstrap, shuffling addresses returned bygetaddrinfo.records (e.g. Kubernetes headless services). The system resolver returns addresses in a
deterministic order (typically RFC 6724 destination-address selection), which defeats
round-robin DNS — clients hammer the first address.