[rust macros] Annatto needs macros for frequently written code

[MartinKl]

Apart from helper functions in util, it might be worth providing macros. This issue is meant to collect candidates:

• parent_name! provides the node name of a parent of a node id or a node name
• parent_id! provides the node id of a parent of a node id or node name
• node_name! provides the node name of a node id
• add_node! could provide a shortcut for update.add_event(UpdateEvent::AddNode ...)
• delete_node! could provide a shortcut for update.add_event(UpdateEvent::DeleteNode ...)
• add_node_label!, delete_node_label!, add_edge!, ...

[MartinKl]

Edge-related macros (add_edge!, delete_edge!, etc) could potentially be provided per component type, e. g. part_of!, rm_part_of!, ...), additionally or instead of more generic macros.