Closes #1108

Changes proposed in this Pull Request

• Settings related to snakemake are all moved to snakemake.settings.types in snakemake version 8.14.0
• In _helpers.py:

from snakemake.settings.types import (
        ConfigSettings,
        DAGSettings,
        ResourceSettings,
        StorageSettings,
        WorkflowSettings,
    )

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.