Update driver to populate tablet metadata for request routing (4.x only)

[bhalevy]

Derived from Tablets implementation plan

@tgrabiec please fill-in the details of this task

[tgrabiec]

The task is to update routing information based on feedback from the server returned in custom_payload field of the response, as documented in this PR: scylladb/scylladb#16148

[roydahan]

@Bouncheck please close if done.

[Bouncheck]

Closing as completed by #241