get tags of edges incident to node

Could be very useful for many applications. For example, getting name of edges incident to a nameless gap in fbn.

Start by locating the package's existing node and edge query entry points and checking how nameless gaps in the bicycle network are represented. Clarify the expected result for all edges incident to a node, using the fbn example as a case to verify. Done means callers can retrieve the relevant edge tags or names consistently.

Written by the indexing model from the issue text.