cpp-driver should default to Advanced Shard Awareness

[fee-mendes]

TLDR; it makes no sense to have a recommended feature that is not the default

It's been long since Scylla <4.3 went out of support, back from a time when it made sense to have basic shard-awareness by default. The world has evolved since then, and Advanced Shard Awareness was introduced, which is able to fallback to basic shard-awareness mode whenever needed.

One potential argument against not enabling it by default would be the need to set cass_cluster_set_local_port_range(start, end) ephemeral port range. I advocate that this parameter should either default to the value of net.ipv4.ip_local_port_range or - if we want something portable - 49152-65535 seems to be the standard "informal agreement" across most platforms.

@jul-stas WDYT?