FmtYAMLError works around `yaml.v2` package's unfortunate choice of multi- line and indented default error formatting, which is unsuitable for logging.

RegisterBackend registers backend constructors with the backend factory.

ConfigBase is the mandatory base part of backend-specific configs for all backends.

targetEnv describes the LightOS cluster environment that will be providing the underlying storage for a given CSI volume in terms of NVMe/NVMe-oF protocol level details.

the LB CSI plugin delegates the handling of the local Linux block devices representing the namespaces exported by the remote LightOS targets to the Backend instances.