feat: generate nexenta charm

[ahmad-can]

Related Charm https://review.opendev.org/c/openstack/sunbeam-charms/+/984507

[Copilot]

Pull request overview

Adds a new Nexenta storage backend implementation to Sunbeam and integrates it into the existing backend test/fixture framework.

Changes:

• Introduce NexentaBackend and its NexentaConfig model under sunbeam.storage.backends.nexenta.
• Add unit tests for the Nexenta backend and extend common backend tests to include it.
• Extend backend test fixtures to provide a nexenta_backend and include it in the parametrized backend set.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sunbeam-python/sunbeam/storage/backends/nexenta/backend.py	New Nexenta backend implementation and configuration model.
sunbeam-python/sunbeam/storage/backends/nexenta/init.py	Package init for the new backend module.
sunbeam-python/tests/unit/sunbeam/storage/backends/conftest.py	Adds Nexenta backend fixture and includes it in any_backend.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_common.py	Extends uniqueness/expectation tests to cover Nexenta.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_nexenta.py	New backend-specific tests for Nexenta config and protocol validation.

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