Support the duration type

[hakuch]

Support for columns of the duration native type was merged into Scylla in scylladb/scylladb@509626f.

The corresponding commit to the 3.X branch of Cassandra also updated cqlsh to support the duration type.

This repository needs to be updated to also include this support, though I'm not sure of the best way to do this. @penberg or @duarten?

[duarten]

I'm not sure either. Either cherry-pick those commits to cqlshlib or fast forward the repo, but I'm not sure what, if any, nefarious side-effects this may have.

[penberg]

@hakuch Since the duration type is still in beta, I think we can just wait a bit on this, no? I think we need to sync up the repository with Apache Cassandra soon anyway, so we'd get support for duration via that.

[hakuch]

@penberg Sure. I'll leave this issue open so that we can all get the satisfaction of closing it once the repository is updated. Thanks!