The new port is configurable from scylla.yaml and defaults to 19042 (unencrypted, unless client configures encryption options and omits `native_shard_aware_transport_port_ssl`). Two "SUPPORTED" tags are added: "SCYLLA_SHARD_AWARE_PORT" and "SCYLLA_SHARD_AWARE_PORT_SSL". For compatibility, "SCYLLA_SHARDING_ALGORITHM" is still kept. Fixes #5239