Draft: NodeConfig can be initialized with a specific key derivation style.

Nodes previously hard-coded a Native key derivation style throughout, which was breaking the lnrod tests. This change adds handling of the different styles to nodes, including passing the style in as a parameter to vlsd2.

This change is tested against lnrod and, along with change to allowlists, gets the full gRPC lnrod integration test running.

Also included in the MR is a slight tidy-up to the various channel/oid functions related to the different derivation styles.