Deprecate methods which reference the index of an address or node id.

Deprecate for removal all methods on the address book which reference the index of the address and node id.

Start by locating the address book APIs and identifying every method that references an address or node ID by index. Check their usages and existing deprecation conventions; done means all in-scope methods are deprecated for removal without breaking remaining address book behavior.

Written by the indexing model from the issue text.