Add ClusterLocal as cluster scheduler without remote connection

[reginabuehler]

Description and Context:
What and Why?

This PR introduces a local cluster scheduler that mirrors the existing Cluster scheduler’s PBS/Slurm + Dask jobqueue workflow, but runs in a local access setting (no remote SSH connection).
It is shared now for visibility and early feedback. A few remaining pieces are still pending and listed below.

What's missing:

•  cluster integration test
• minimizing code redundancy to schedulers/cluster.py

Related Issues and Pull Requests

• Closes
• Related to

Interested Parties

@dharinib98: This branch would allow us to run QUEENS simulations locally on the cluster.

Note: More information on the merge request procedure in QUEENS can be found in the Submit a pull request section in the CONTRIBUTING.md file.