Adds an edge from one node to another in a a directed graph builder.
See also
Other build graphs:
add_path(),
build_acyclic(),
build_directed(),
graph_builder(),
populate_edges()
Examples
graph_builder() |>
add_edge("A", "B")
#> <pointer: 0x5624ab8dc280>
#> attr(,"class")
#> [1] "DirectedGraphBuilder"