Enable role argument validation based on an argument specification

[Normo]

Once we place the argument specification into the meta/argument_specs.yml file, Ansible will automatically use it to validate variables before executing an Ansible role.

See https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_reuse_roles.html#role-argument-validation

Benefits

• Enables argument validation when using the roles
• Provides inline documentation for role parameters
• Improves IDE/editor autocomplete support
• Follows Ansible best practices for role metadata