Feat: Interface config

[kdhlab]

Draft for #157

[kdhlab]

Summary of changes:

1. Renamed the following files:

• plugins/modules/interfaces_assignments.py to interfaces_configuration.py
• plugins/module_utils/interfaces_assignments.py to interfaces_configuration.py

2. Created a alias in meta/runtime.yml to ensure that if the old interfaces_assignments is called it will use the new module.
3. Updated all references to interfaces_assignments to the new name.
4. The updated ansible module allows you to set any valid key for an interface, it also allows you to delete interfaces.

Due to the possible permutations of configurations here I did not write any real tests or error checking outside of the basics.