Feature/rfd 133 explore

[alexlovelltroy]

This pull request introduces a new vendor-agnostic BMC (Baseboard Management Controller) client abstraction layer, enabling vendor-specific handling and plugin registration for BMC operations. It provides a unified interface for BMC interactions, a registry for vendor plugin detection and dispatch, and a manager for connection/session management. Comprehensive tests are included for all new components. The most important changes are as follows:

BMC Client Abstraction and Vendor Plugin System:

• Introduced a new Client interface in pkg/bmc/client.go that abstracts BMC operations and shields callers from vendor-specific details. Added a default GenericClient implementation and a mechanism for vendor plugins to override behavior. Also defined the Vendor type and error handling for unsupported operations.
• Added a plugin registry system in pkg/bmc/registry.go to allow vendor plugins to register detectors and factories. The clientFor function wraps a gofish client with the most specific registered vendor client or falls back to the generic client.
• Registered the in-tree BMC vendor plugins in cmd/root.go by blank-importing pkg/bmc/vendors so their init() functions run and register themselves.
• Added a Cray-specific vendor plugin in pkg/bmc/vendors/cray/cray.go that detects Cray BMCs and provides a placeholder for Cray-specific quirks.

Connection and Session Management:

• Implemented a ConnConfig struct in pkg/bmc/conn.go for canonical BMC connection configuration, including credential resolution logic.
• Added a Manager in pkg/bmc/manager.go as the single authority for opening and caching BMC sessions, performing vendor detection, and managing session lifecycles.

Testing and Validation:

• Added comprehensive unit tests for the new client abstraction (pkg/bmc/client_test.go), connection configuration (pkg/bmc/conn_test.go), manager/session logic (pkg/bmc/manager_test.go), and plugin registry (pkg/bmc/registry_test.go). [1] [2] [3] [4]

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