Add a config option to make driver threads daemon

Description

We don't make our threads daemon by default, but this is a common request.

Right now the way to do it is to override `NettyOptions`, but that's a bit heavyweight since it's an internal class (needs custom context and session builder, etc.)

We could easily expose that in the config.
A single option for all thread factories sounds good enough.

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Assignee

Olivier Michallat

Reporter

Olivier Michallat

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Minor
Configure