Add support for providing custom maintenance windows during cluster creation

[mixellent]

Context

Following the completion of https://github.com/scylladb/siren/pull/10627#issuecomment-2009962617 (adding support for default MWs and customizing MWs), it is now possible to set and customize maintenance windows as part of the Cluster Creation Public API.

We want to let customers apply custom maintenance windows also via the TF provider.

What needs to be done

Add relevant parameter(s) for user to define up to 4 maintenance windows on a new cluster.

[rjeczalik]

Related: #95 (comment)