[Enhancement]: Add support for dynamic compute nodes

[NucciTheBoss]

The latest versions of Slurm support dynamic nodes. The -Z and --conf flags must be used in order for a compute node to start up as a dynamic node. However, the slurmd.wrapper script currently does not support this configuration. It only supports configless mode and the traditional configuration method currently.

We should enable dynamic node support in the snap. This will make our lives easier when deploying and maintaining Charmed HPC clusters as we will not need to be as reliant on Juju lifecycle events to updates the current Slurm configuration. Instead of having to manage data buckets, we can just restart the slurmd daemon on the compute node and it will immediately reflect the updated configuration.