Docs: how to use shard awareness?

[tzach]

Copy from @sitano https://github.com/scylladb/scylla-docs/issues/3325

The documentation must explicitly answer the following questions:

How to enable shard awareness How shard awareness is connected to the TokenAwarePolicy Is it required to specify (2) policy explicitly during Connect call What will happen if you would not specify (2) explicitly to Connect call If nothing is required to enable shard awareness what are the conditions when it works and how to verify it is enabled tokenAwareHostPolicy what is - there is no such a class in the driver version 3.10.x What is the correct way of initializing driver with/out the default settings