Add baremetal_port_group module

Add support for managing Ironic baremetal port groups.

Include CI role coverage and unit tests for create, update, delete, and check mode behavior.

Add a reno fragment describing the new module.

Tests-Run: python -m pytest tests/unit/modules/cloud/openstack/test_baremetal_port_group.py
Change-Id: I98564fcb5b81a1dd7be1fbf5ffca364483296655

ci/roles/baremetal_port_group/defaults/main.yml

@@ -0,0 +1,12 @@
+expected_fields:
+  - address
+  - created_at
+  - extra
+  - id
+  - links
+  - mode
+  - name
+  - node_id
+  - properties
+  - standalone_ports_supported
+  - updated_at