feat: generate ibmibmstorage charm

[ahmad-can]

Related Charm https://review.opendev.org/c/openstack/sunbeam-charms/+/983832

[Copilot]

Pull request overview

Adds a new Cinder storage backend implementation and accompanying unit tests for an IBMStorage-based charm, integrating it into the existing backend test matrix.

Changes:

• Introduce IbmibmstorageBackend and IbmibmstorageConfig under sunbeam.storage.backends.ibmibmstorage.
• Add backend-specific unit tests and hook the new backend into shared backend fixtures and uniqueness checks.
• Extend common backend tests to include the new backend in parametrized runs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
sunbeam-python/sunbeam/storage/backends/ibmibmstorage/backend.py	New IBMStorage backend + Pydantic config model (including enums/options).
sunbeam-python/sunbeam/storage/backends/ibmibmstorage/__init__.py	Package initializer and module docstring for the new backend.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_ibmibmstorage.py	New unit tests for backend identity, secrets, and protocol validation.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_common.py	Extend shared uniqueness/expectation tests to include the new backend.
sunbeam-python/tests/unit/sunbeam/storage/backends/conftest.py	Add fixtures for the new backend and include it in the any_backend parametrization.

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